Complex sentence: They left the ship and called the family at 10:00 pm that night, reporting to the family that there was no evidence of foul play, and therefore, they concluded that he must have fallen overboard.
Split into simpler sentences: They left the ship and called the family at 10 PM that night. They reported to the family that there was no evidence of foul play, and therefore, they concluded that he must have fallen overboard.