Complex sentence: The Abbot encouraged Jow Lung to combine all 3 of the Kung Fu systems he had mastered into a single style and stayed in the monastery for over three years before achieving this goal.
Split into simpler sentences: The Abbot encouraged Jow Lung to combine all 3 of the Kung Fu systems he had mastered into a single style. He stayed in the monastery for over three years before achieving this goal.