Complex sentence: Ahearn learns there are survivors at Grant High and searches for his daughter, joined by firefighter Bruce Summerlin (Mark Rolston), whom he'd argued with over the gas incident before.
Split into simpler sentences: Ahearn learns there are survivors at Grant High and goes to find his daughter. He is joined by firefighter Bruce Summerlin (Mark Rolston), whom he'd argued with over the gas incident before.