Complex sentence: In the summer 1994, Engonga was bought by league powerhouse Valencia CF. He played three years at Valencia, before moving to RCD Mallorca, under Héctor Cúper's supervision.
Split into simpler sentences: In the summer 1994, Engonga was bought by league powerhouse Valencia CF, where he played three seasons. Subsequently, he moved to RCD Mallorca, under Héctor Cúper's supervision.