Complex sentence: He found time to take an interest in the public service association of which he was president several times, he was the prime mover in organizing the public teachers' provident fund, and he was also associated with the public service provident fund.
Split into simpler sentences: He found time to take an interest in the public service association of which he was president several times. He was the prime mover in organizing the public teachers' provident fund, and he was also associated with the public service provident fund.