Complex sentence: The Fort Hunter land, at the mouth of the Schoharie on both sides, (approximately 80 acres) was deeded in 1697 to Jan Peterse Mabee because his wife Anna Borsboom, apparently of mixed race, was "something related to the Indian castle".
Split into simpler sentences: The Fort Hunter land, approximately 80 acres on both sides of the mouth of the Schoharie, was deeded in 1697 to Jan Peterse Mabee. He had an advantage because his wife Anna Borsboom, apparently of mixed race, was "something related to the Indian castle".