Complex sentence: His total synthesis of azadirachtin, completed in 2007, is widely regarded as one of the major landmarks in total synthesis.He has also made substantial advances in many areas of organic chemistry, including the development of new catalysts, protecting groups and reagents.
Split into simpler sentences: His total synthesis of azadirachtin, completed in 2007, is widely regarded as one of the major landmarks in total synthesis. In the course of this work, he has also made substantial advances in many areas of organic chemistry, including the development of new catalysts, protecting groups and reagents.