Complex sentence: Nettie Maria Stevens (1861-1912) Stevens was able to provided proof for Calvin Bridges' hypothesis that genes were contained in chromosomes by examining the chromosomes of the fruit flys (Drosophila).
Split into simpler sentences: Nettie Maria Stevens (1861-1912) Stevens was able to provided proof for Calvin Bridges' hypothesis that genes were contained in chromosomes. She did this by examining the chromosomes of the fruit flys (Drosophila).