Complex sentence: Aigre belonged to the Lordship of Marcillac and was a very poor vicarage of the archpriest of Ambérac, vacant, and annexed to Mons from the 15th century.
Split into simpler sentences: Aigre belonged to the Lordship of Marcillac and was a very poor vicarage of the archpriest of Ambérac. It was vacant and annexed to Mons from the 15th century.