Complex sentence: Groot took it upon himself to debut for ZVV Zaandijk in March, three months earlier than the courts ruling, however he broke his leg in the first match back, and was sidelined from football for months, leading to his eventual retirement.
Split into simpler sentences: Groot took it upon himself to debut for ZVV Zaandijk in March, three months earlier than the court ruling. However, he broke his leg in the first match back and was sidelined from football for months, leading to his eventual retirement.