Complex sentence: During the early Paleozoic the deep ocean basin that existed in central and southern Arkansas was liften when South America collided with North America creating the folded Ouachita Mountains and uplifting the Ozark plateau to the north.
Split into simpler sentences: During the early Paleozoic a deep ocean basin existed in central and southern Arkansas. Then South America collided with North America creating the folded Ouachita Mountains and uplifting the Ozark plateau to the north.