Complex sentence: Buchanan, 285 Bitter after being passed over for promotion and plagued by severe attacks of sciatica, Morgan left the army in 1779, but a year later he was promoted to Brigadier General and returned to service in the Southern Department.
Split into simpler sentences: Buchanan, 285 Bitter after being passed over for promotion and plagued by severe attacks of sciatica, Morgan left the army in 1779. A year later he was promoted to Brigadier General and returned to service in the Southern Department.