Complex sentence: He was member of the Lockwood Committee that investigated the City of New York, the chairman of New York State Commission to investigate child welfare, and a member of the joint Legislative committee to investigate exploitation of immigrants.
Split into simpler sentences: He was member of the Lockwood Committee that investigated the City of New York. Later he was the chairman of New York State Commission to investigate child welfare, and a member of the joint Legislative committee to investigate exploitation of immigrants.