Complex sentence: He later claimed that he had been outside by the pool and had come in at 2:40am to find Kathleen at the foot of the stairs, he maintained she must have fallen down the stairs after consuming alcohol and valium.
Split into simpler sentences: He later claimed that he had been outside by the pool and had come in at 2:40am to find Kathleen at the foot of the stairs. He maintained she must have fallen down the stairs after consuming alcohol and valium.