Complex sentence: He attended Phillips Academy in Andover, Massachusetts, in 1914 and he graduated in 1918 from Yale University in New Haven, Connecticut where he was a member of Skull & Bones and captain of the wrestling team.
Split into simpler sentences: He attended Phillips Academy in Andover, Massachusetts, graduating in 1914. He graduated in 1918 from Yale University in New Haven, Connecticut where he was a member of Skull & Bones and captain of the wrestling team.