Complex sentence: In 1988 Renaissance's established its most famous portfolio, the Medallion fund, is widely considered to be one of the most successful hedge funds ever that has averaged a 71.8% annual return, before fees, from 1994 through mid- 2014.
Split into simpler sentences: In 1988 Renaissance's established its most famous portfolio, the Medallion fund, which is widely considered to be one of the most successful hedge funds ever. Medallion averaged a 71.8% annual return, before fees, from 1994 through mid- 2014.