Complex sentence: He carries on as a pool attendant, oblivious to the fact that he gets the lowest wages in the whole centre, which eventually causes him to run riot and hold Gavin, Linda and Colin hostage in the staff room.
Split into simpler sentences: He carries on as a pool attendant, oblivious to the fact that he is earning the lowest wages of anyone in the centre. He eventually discovers this, which causes him to run riot and hold Gavin, Linda and Colin hostage in the staff room.