Complex sentence: It was originally constructed for Henry T. Sloane, son of a found of the carpet firm W. & J. Sloane and later became the French School, along with its extensions in the former Oliver Gould Jennings House.
Split into simpler sentences: It was originally constructed for Henry T. Sloane, son of a founder of the carpet firm W. & J. Sloane. It later housed the French School, along with its extensions in the former Oliver Gould Jennings House.