Complex sentence: Cassius Marcellus Clay, gave the same name to his son, who later became the world famous heavy weight champion boxer who later changed his name to Muhammad Ali after he converted to the religion of the Nation of Islam and later to Sunni Islam.
Split into simpler sentences: Cassius Marcellus Clay, gave the same name to his son, who later became the world famous heavy weight champion boxer. This hall of fame athlete later changed his name to Muhammad Ali after he converted to the religion of the Nation of Islam and later to Sunni Islam.