Complex sentence: In the late 1980s, he developed project-specific custom decompression tables, and his work with decompression tables, physiological effects of gases, and methods of managing exposure to oxygen, helped to open up the new field of technical diving.
Split into simpler sentences: In the late 1980s, he developed project-specific custom decompression tables. His work with decompression tables, physiological effects of gases, and methods of managing exposure to oxygen, helped to open up the new field of technical diving.