Complex sentence: Born on March 2,1922, Greenglass married his wife Ruth (née Printz) in 1942, when she was only 17 years old and they joined the Young Communist League shortly before Greenglass entered the U.S. Army in 1943.
Split into simpler sentences: Born on March 2,1922, Greenglass married his wife Ruth (née Printz) in 1942, when she was only 17 years old. The two joined the Young Communist League shortly before Greenglass entered the U.S. Army in 1943.