Complex sentence: Just before 5 a.m. eastern U.S. time, two Sukhoi Su-25 attack aircraft made two passes at the drone firing their 30 mm cannons, but missed and the Predator returned to base unharmed.
Split into simpler sentences: Just before 5 a.m. eastern U.S. time, two Sukhoi Su-25 attack aircraft. They made two passes at the drone firing their 30 mm cannons, but missed and the Predator returned to base unharmed.