Complex sentence: Charlie Cox, was initially convinced by Winger's report but said that he "became suspicious" when Winger kept showing up at the police station, a pattern that began a few months after the murders occurred when Winger came by to ask for his gun back.
Split into simpler sentences: Charlie Cox, was initially convinced by Winger's report but said that he "became suspicious" when Winger kept showing up at the police station. It reportedly had begun a few months after the murders occurred when Winger came by to ask for his gun back.