Complex sentence: Jan was the last in line to land but did not complete the break in formation after the last maneuver, a flyover at show center, instead the aircraft continued straight ahead losing altitude until it hit the ground.
Split into simpler sentences: Jan was the last in line to land but did not complete the break in formation after the last maneuver, a flyover at show center. Instead, the aircraft continued straight ahead losing altitude until it hit the ground.