Complex sentence: Since 1818, Stuttgart oldest university, located in Hohenheim, is the University of Hohenheim, it is not related to the University of Stuttgart (founded 1829), apart from some cooperations.
Split into simpler sentences: Since 1818, Stuttgart's oldest university, located in Hohenheim, is the University of Hohenheim. It is not related to the University of Stuttgart (founded 1829), apart from some cooperations.