Complex sentence: Dr. Sellin came to prominence in the 1920s and 30s for his studies in the use of criminal statistics at local, state, national and international levels, and later helped draft the U.S. Uniform Criminal Statistics Act in 1944.
Split into simpler sentences: Dr. Sellin came to prominence in the 1920s and 30s for his studies in the use of criminal statistics at local, state, national and international levels. He later helped draft the U.S. Uniform Criminal Statistics Act in 1944.