Complex sentence: He attended, but did not graduate from, Georgia Tech. Enlisitng in 1946, he serving for two years in the United States Marine Corps, he played the tuba and horn in the Marine Corps Band, although he was also skilled in the sousaphone and percussion.
Split into simpler sentences: He attended, but did not graduate from, Georgia Tech. Enlisting in 1946, he served for two years in the United States Marine Corps. He played the tuba and horn in the Marine Corps Band, and he was also skilled at playing the sousaphone and percussion.