Complex sentence: Like his father before him, Alec Waugh went to school at Sherborne, and, it was presumed by the family that Evelyn would follow, but in 1915, the school asked Alec to leave, after a homosexual relationship came to light.
Split into simpler sentences: Like his father before him, Alec Waugh went to school at Sherborne, and, it was presumed, by the family, that Evelyn would follow. Yet, in 1915, the school asked Alec to leave, after a homosexual relationship came to light.