Complex sentence: Wishart agrees with Birt in rejecting the murder-suicide theory, but contrary to Booth, Yallop and Birt, he does not believe Jeannette's father Len Demler had anything to do with the murders or removing the bodies after their deaths.
Split into simpler sentences: Wishart agrees with Birt in rejecting the murder-suicide theory. But contrary to Booth, Yallop and Birt he does not believe Jeannette's father Len Demler had anything to do with the murders or removing the bodies after their deaths.