Complex sentence: One obstacle to the international development of lacrosse had been the existence of separate governing bodies for the men's and women's versions of the sport, with men's lacrosse being governed by ILF and the women's version by IFWLA.
Split into simpler sentences: One obstacle to the international development of lacrosse had been separate governing bodies for the men's and women's versions of the sport. Men's lacrosse was governed by ILF and the women's version by IFWLA.