Complex sentence: His ideas were based on his studies on mountain ranges as the Andes, Rockies, Alps and Himalayas, concluding that these mountains could have been formed only as a result of titanic lateral pressures that thrust the earth's surface upward.
Split into simpler sentences: His ideas were based on his studies on mountain ranges as the Andes, Rockies, Alps and Himalayas. He concluded that these mountains could have been formed only as a result of titanic lateral pressures that thrust the earth's surface upward.