Complex sentence: Taken to the hospital, Calhoun's ambulance was attacked by members of the Hybrid; while the Blue Beetle was fighting them, Mento transformed the molten metal covering Calhoun into a permanent metallic shell.
Split into simpler sentences: Taken to the hospital, Calhoun's ambulance was attacked by members of the Hybrid. While the Blue Beetle was fighting them, Mento transformed the molten metal covering Calhoun into a permanent metallic shell.