Complex sentence: Roger Yonchien Tsien (born February 1,1952) is a Chinese American biochemist and a professor at the Department of Chemistry and Biochemistry, University of California, San Diego.
Split into simpler sentences: Roger Yonchien Tsien (born February 1,1952) is a American biochemist. He is a professor at the Department of Chemistry and Biochemistry, University of California, San Diego.