Complex sentence: She is frequently said to have owned large estates, including Cane River's fabled Melrose Plantation, which land was granted to and built on by her son, Louis Metoyer.
Split into simpler sentences: She is frequently said to have owned large estates, including Cane River's fabled Melrose Plantation. In fact, this land was granted to and built on by one of her sons, Louis Metoyer.