Complex sentence: Many of his ex-slaves became soldiers in the Cuban War of Independence against Spain fighting on the side of the Cubans, but it is unclear whether or not his freed slaves volunteered for their enrollment in the military.
Split into simpler sentences: Many of his ex-slaves became soldiers in the Cuban War of Independence against Spain fighting on the side of the Cubans. It is unclear whether or not his freed slaves volunteered for their enrollment in the military.