Complex sentence: In the summer of 1922 he was accused of being a traitor by his peers, because it was believed they became jealous of the general's admiration of him, and was shot in the back while in the line of duty.
Split into simpler sentences: In the summer of 1922, he was accused of being a traitor by his peers because it was believed they became jealous of the general's admiration of him. Martino was shot in the back while in the line of duty.