Complex sentence: As a result of John F. Kennedy becoming president in 1960, Otis became an important stop for Air Force One, because of the proximity of the Kennedy Compound, called the Summer White House during his tenure in office.
Split into simpler sentences: As a result of John F. Kennedy becoming president in 1960, Otis became an important stop for Air Force One. Because of the proximity of the Kennedy Compound, called the Summer White House during his tenure in office.