Complex sentence: After accepting prize money from tournaments played in France Alcayaga lost his amateur status and started his professional career, attaining a world rank of 1200 within his first 3 months he hired a coach to guide him and take the reins in his tennis career.
Split into simpler sentences: After accepting prize money from tournaments played in France Alcayaga lost his amateur status and started his professional career, attaining a world rank of 1200 within his first 3 months. He hired a coach to guide him and take the reins in his tennis career.