Complex sentence: Its title song, "Arthur's Theme (Best That You Can Do)", won the Best Original Song, which was co-written by Christopher Cross, Burt Bacharach, Carole Bayer Sager and Peter Allen, and performed by Christopher Cross.
Split into simpler sentences: Its title song, "Arthur's Theme (Best That You Can Do)", won the Best Original Song. Co-written by Christopher Cross, Burt Bacharach, Carole Bayer Sager and Peter Allen, it was performed by Christopher Cross.