Complex sentence: According to the "Associated Press" Memon disappeared four years ago in 2003, and was held in "mysterious detention" and released on April 28,2007, when he was left in front of his home in Karachi.
Split into simpler sentences: According to the "Associated Press" Memon disappeared four years ago, and held in "mysterious detention". They report he was released on April 28,2007, when he was left in front of his home in Karachi.