MMA RETURNS TO CBS; SHIELDS UPSETS HENDERSON TO RETAIN STRIKEFORCE TITLE NASHVILLE, Tenn. (April 18, 2010) – Saturday night marked MMA’s return to primetime on CBS featuring a STRIKEFORCE World Championship Tripleheader. The event aired live on the CBS Television Network at 9 p.m. ET/PT. Attendance at the Breakstone Arena was 8,196. Jake Shields (21-4-1)…