Complex sentence: As David begins his investigations, he becomes aware of a presence in the house which goes against everything he believes thus strengthening his determination to expose the paranormal activities as nothing more than a hoax perpetrated by joker, younger brother Simon (Alex Lowe).
Split into simpler sentences: As David begins his investigations he becomes aware of a presence in the house which goes against everything he believes. This strengthens his determination to expose the paranormal activities as nothing more than a hoax perpetrated by younger brother Simon (Alex Lowe).