Complex sentence: The scenarios present in the game are based on situations designer Jim Walls or his friends were in while in the police force, and the real Jessie Bains (whose name was changed) did escape and was on the loose at the time the game was released.
Split into simpler sentences: The scenarios present in the game are based on situations designer Jim Walls or his friends were in while in the police force. The antagonist Jessie Bains is based on a convict who did escape and was on the loose at the time the game was released.