योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-24, verse-45

क्वचिद्वहत्पुरोवृत्तकल्पवृक्षलतावनम् ।
क्वचिद्दैत्यहतोत्तुङ्गप्रपतद्देवपत्तनम् ॥ ४५ ॥

kvacidvahatpurovṛttakalpavṛkṣalatāvanam ,
kvaciddaityahatottuṅgaprapataddevapattanam 45

45. kvacit vahant puro-vṛtta-kalpa-vṛkṣa-latā-vanam
kvacit daitya-hata-uttuṅga-prapatat-deva-pattanam

45. kvacit vahant puro-vṛtta-kalpa-vṛkṣa-latā-vanam,
kvacit daitya-hata-uttuṅga-prapatat-deva-pattanam.

45. In some places, there are ancient forests of wish-fulfilling trees and vines through which streams flow. In others, there are lofty cities of the gods, struck down by demons and collapsing.

Words meanings summery:

• क्वचित् (kvacit) - in some places (sometimes, somewhere, in some places)

• वहन्त् (vahant) - flowing (with streams) (flowing, carrying, bearing)

• पुरो-वृत्त-कल्प-वृक्ष-लता-वनम् (puro-vṛtta-kalpa-vṛkṣa-latā-vanam) - ancient forests of wish-fulfilling trees and vines

• क्वचित् (kvacit) - in others (sometimes, somewhere, in some places)

• दैत्य-हत-उत्तुङ्ग-प्रपतत्-देव-पत्तनम् (daitya-hata-uttuṅga-prapatat-deva-pattanam) - lofty cities of the gods, struck down by demons and collapsing (lofty cities of gods, struck down by demons and collapsing)

Words meanings and morphology

क्वचित् (kvacit) - in some places (sometimes, somewhere, in some places)

(indeclinable)

वहन्त् (vahant) - flowing (with streams) (flowing, carrying, bearing)

(adjective)

Accusative, neuter, singular of vahant

vahant - flowing, carrying, bearing

Present Active Participle

from root vah

Root: vah (class 1)

Note: modifies 'vanam' implicitly, referring to streams within it

पुरो-वृत्त-कल्प-वृक्ष-लता-वनम् (puro-vṛtta-kalpa-vṛkṣa-latā-vanam) - ancient forests of wish-fulfilling trees and vines

(noun)

Accusative, neuter, singular of puro-vṛtta-kalpa-vṛkṣa-latā-vana

puro-vṛtta-kalpa-vṛkṣa-latā-vana - ancient forests of wish-fulfilling trees and vines

Compound type : karma-dhāraya (puro-vṛtta+kalpa-vṛkṣa-latā-vana)

• puro-vṛtta – ancient, previously existing, transpired before
  adjective
  Past Passive Participle
  puras (before/front) + vṛtta (happened/existed)
  Root: vṛt (class 1)
• kalpa-vṛkṣa – wish-fulfilling tree
  noun (masculine)
• latā – creeper, vine
  noun (feminine)
• vana – forest, grove
  noun (neuter)

क्वचित् (kvacit) - in others (sometimes, somewhere, in some places)

(indeclinable)

दैत्य-हत-उत्तुङ्ग-प्रपतत्-देव-पत्तनम् (daitya-hata-uttuṅga-prapatat-deva-pattanam) - lofty cities of the gods, struck down by demons and collapsing (lofty cities of gods, struck down by demons and collapsing)

(noun)

Accusative, neuter, singular of daitya-hata-uttuṅga-prapatat-deva-pattana

daitya-hata-uttuṅga-prapatat-deva-pattana - lofty cities of gods, struck down by demons and collapsing

Compound type : bahuvrīhi (daitya-hata+uttuṅga+prapatat+deva-pattana)

• daitya – demon, descendant of Diti
  noun (masculine)
• hata – killed, struck down, destroyed
  adjective
  Past Passive Participle
  from root han
  Root: han (class 2)
• uttuṅga – very high, lofty, towering
  adjective
  Prefix: ut
  Root: tuṅg (class 1)
• prapatat – falling down, collapsing
  adjective
  Present Active Participle
  from pra-pat
  Prefix: pra
  Root: pat (class 1)
• deva – god, deity
  noun (masculine)
• pattana – city, town
  noun (neuter)

Note: modifies an implied 'place' or 'scene'