Complex sentence: The Mac AIDS Fund was established in Toronto in 1994 by Frank Angelo and Frank Toskan, who in 1985 had co-founded MAC Cosmetics, a manufacturer of make-up for both the consumer and professional markets.
Split into simpler sentences: The Mac AIDS Fund was established in Toronto in 1994 by Frank Angelo and Frank Toskan. In 1985 they had co-founded MAC Cosmetics, a manufacturer of make-up for both the consumer and professional markets.