Complex sentence: In 1966, he was deemed fit for service based upon a military medical examination, and in 1968 was briefly classified as fit by a local draft board, but was given a 1-Y medical deferment in October 1968, attributed to heel spurs.
Split into simpler sentences: In 1966, he was deemed fit for service based upon a military medical examination, and in 1968 was briefly classified as fit by a local draft board. In October of that year, he was given a 1-Y medical deferment, which was attributed to heel spurs.