Complex sentence: Many brigands and bandits had allied themselves with the Liberal cause during the civil war, and with that conflict concluded, many became guerrillas and bandits again when the government jobs they demanded as rewards for their services to the Republic were not forthcoming.
Split into simpler sentences: Many brigands and bandits had allied themselves with the Liberal cause during the civil war. With that conflict concluded, many became guerrillas and bandits again, when the government jobs they demanded as rewards for their services to the Republic were not forthcoming.