Complex sentence: In 1972, the struggle between ILTF and WCT ended with ILTF's ban of the contract pro players from January to July and consequently the WCT contract pros were strictly forbidden to play the Grand Prix circuit including Roland Garros and Wimbledon.
Split into simpler sentences: In 1972, the struggle between ILTF and WCT ended with the ILTF banning contract professional players from January to July. Consequently the WCT contract pros were strictly forbidden to play the Grand Prix circuit including the French Open and Wimbledon.