Complex sentence: At the Chilean Revolution of 1851, he was the head of General José María de la Cruz's rebel army general staff, while the government troops were under the command of General Manuel Bulnes, of whom his son Manuel was personal adjutant.
Split into simpler sentences: At the Chilean Revolution of 1851, he was the head of General José María de la Cruz's rebel army general staff. The government troops were under the command of General Manuel Bulnes, of whom his son Manuel was personal adjutant.