Complex sentence: After the stage is exhausted the engine module is jettisoned for reentry, at a certain point in the descent Adeline would pull up using its small winglets and steer itself towards a runway whilst gliding.
Split into simpler sentences: After the stage is exhausted, the engine module is jettisoned for reentry. A at a certain point in the descent, Adeline would pull up using its small winglets and steer itself towards a runway whilst gliding.