Complex sentence: A nine-year-old boy who is the son of Doctor Tenma who was fatally wounded in a car accident; after being neglected by his father, he goes in his car alone and crashes into an oncoming truck.
Split into simpler sentences: A nine-year-old boy who is the son of Doctor Tenma who was fatally wounded in a car accident. After being neglected by his father, he goes in his car alone and crashes into an oncoming truck.