Complex sentence: The police then communicate with Roy, informing him that his mother has committed suicide; he presumes that Moira killed her, however, when he sees the body, he notices there is no burn on her hand.
Split into simpler sentences: The police then visit Roy, informing him that his mother has committed suicide. He presumes that Moira killed her, however, when he sees the body, he notices there is no burn on her hand.