Complex sentence: In the late 1980s Dr. Resh assisted a Florida company growing lettuce in a floating raft culture system and in preparing greenhouse proposals for construction and operation of large greenhouses using waste heat from cogeneration power plants in the northeastern United States.
Split into simpler sentences: In the late 1980s Dr. Resh assisted a Florida company growing lettuce in a floating raft culture system. He helped prepare greenhouse proposals for construction, and assisted with the operation of large greenhouses using waste heat from cogeneration power plants in the northeastern United States.