Complex sentence: He was known as a pioneer of polymer science, studying polymerization processes as part of the U.S. synthetic rubber program during World War II and inventing and patenting polyether polyurethane foam rubber.
Split into simpler sentences: He was known as a pioneer of polymer science. He studyied polymerization processes as part of the U.S. synthetic rubber program during World War II and invented and patented polyether polyurethane foam rubber.