Complex sentence: On 17 December 1971, Henri Patrelle regained the presidency of the club, but the season was marked by the split the Parisians and the Sangermanois in May 1972.
Split into simpler sentences: On 17 December 1971, Henri Patrelle regained the Presidency of the club. The season was marked by the split the Parisians and the Sangermanois in May 1972.