Complex sentence: He comes across a grave where a hand grabs him and pulls him to the ground after that he is in a wheelchair carried into a mental hospital, then he escapes and is chased by the nurse and three staff persons who look strange.
Split into simpler sentences: He comes across a grave where a hand grabs him and pulls him to the ground. Then he is shown in a wheelchair carried into a mental hospital, but he escapes and is chased by the nurse and three staff persons who look strange.