Complex sentence: She held that her mother was illegally held after Spain abolished Indian slavery in its territories in 1769, so the children, including Marguerite, should have been considered free at birth and not born into slavery.
Split into simpler sentences: She held that her mother was illegally held after Spain abolished Indian slavery in its territories in 1769. Her children, including Marguerite, should have been considered free at birth and not born into slavery.