Complex sentence: Ross earned B.S. and M.S. degrees and finished his Ph.D. in number theory at the University of Chicago in 1931 with Dickson as his adviser and his dissertation, "On Representation of Integers by Indefinite Ternary Quadratic Forms of Quadratfrei Determinant".
Split into simpler sentences: Ross earned B.S. and M.S. degrees and finished his Ph.D. in number theory at the University of Chicago in 1931 with Dickson as his adviser. Ross's dissertation was, "On Representation of Integers by Indefinite Ternary Quadratic Forms of Quadratfrei Determinant".