Complex sentence: Subsequently, between December 2004 and January 2006, at three clinical sites in Missouri, 67 patients suffering moderate osteoarthritis of the knee were divided into two groups, one group was administered a placebo and the other, 500 mg of EM per day.
Split into simpler sentences: Subsequently, between December 2004 and January 2006, at three clinical sites in Missouri, 67 patients suffering moderate osteoarthritis of the knee were divided into two groups. One group was administered a placebo and the other received 500 mg of EM per day.