Complex sentence: Kat dismisses this theory, just like she did two years ago, but after mentioning the topic to her friends Beth and Mickey they say that they had suggested that to her even before the cops, though Kat had ignored it.
Split into simpler sentences: Kat dismisses this theory, just like she did two years ago. But after mentioning the topic to her friends Beth and Mickey, they say that they had suggested that to her even before the cops, but Kat ignored it.