Complex sentence: He discovered the role of Phosphocreatine and Adenosine Triphosphate (ATP) in muscular activity, which earned him an entry into biochemistry textbooks in the 1930s.
Split into simpler sentences: He discovered the role of Phosphocreatine and Adenosine Triphosphate (ATP) in muscular activity. This earned an entry into the biochemistry textbooks in the 1930s.