Complex sentence: Throughout the 1960s and 1970s he continued to work as a principal contributor to the U.S. Air Force program on high temperature polymer synthesis, including the synthesis of thermally stable ladder or partial ladder polypyrrolones.
Split into simpler sentences: Throughout the 1960s and 1970s he continued to work as a principal contributor to the U.S. Air Force program on high temperature polymer synthesis. Among other projects, he continued to work on the synthesis of thermally stable ladder or partial ladder polypyrrolones.