Complex sentence: The FOXP2 gene is encoded for production of the forkhead box protein P2 which is involved in human speech and language (as well as bird song and mouse vocalization) and may have played an important role in human evolution.
Split into simpler sentences: The FOXP2 gene is encoded for production of the forkhead box protein P2 which is involved in human speech and language, bird song and mouse vocalization. FOXP2 may have played an important role in human evolution.