As the last ice age gradually ended, the warming climate caused plants and animals, which had adapted to a cooler, wetter climate to migrate up the mountainsides.
(the last ice age; gradually ended; ) (the warming climate; caused; plants and animals, which had adapted to a cooler, wetter climate; T:As the last ice age gradually ended) (plants and animals; had adapted; to a cooler, wetter climate)
the last ice age the warming climate plants and animals
gradually ended caused had adapted
plants and animals, which had adapted to a cooler, wetter climate T:As the last ice age gradually ended
to a cooler, wetter climate