Complex sentence: The Canadian Soccer League (CSL) is an unsanctioned semi-professional soccer league in Canada, formerly sanctioned by the Canadian Soccer Association (CSA) but now affiliated with the Soccer Federation of Canada (SFC).
Split into simpler sentences: The Canadian Soccer League (CSL) is an unsanctioned semi-professional soccer league in Canada. It used to be sanctioned by the Canadian Soccer Association (CSA) but now has affiliated itself with the organization known as Soccer Federation of Canada (SFC).