Complex sentence: He differed from J. J. Reiske and Silvestre de Sacy in regarding Arabic as a handmaid to Hebrew, with Reiske maintaining that Arabic studies should not be taught as part of theology, but as mathematics, physics, geography and medicine.
Split into simpler sentences: He differed from J. J. Reiske and Silvestre de Sacy in regarding Arabic as a handmaid to Hebrew. Reiske maintained that Arabic studies should not be taught as part of theology, but as a subject matter in its own right, as was mathematics, physics, geography and medicine.