Complex sentence: Before 1968, his art was inspired by Pop-art, but soon found an interest in planes and human powered flight which is also reflected in his name, which supposedly is an acronym for "Pan American Airlines and Company".
Split into simpler sentences: Before 1968, his art was inspired by Pop-art, but early on he became interested in planes and human powered flight. This interest is also reflected in his name, which supposedly is an acronym for "Pan American Airlines and Company".