Complex sentence: In March 1945 he led the IV SS Panzer Corps in the failed Lake Balaton Offensive and following the Soviet counter-offensive his corps was forced to retreat into Austria, where it surrendered to the U.S forces.
Split into simpler sentences: In March 1945 he led the IV SS Panzer Corps in the failed Lake Balaton Offensive. Following the Soviet counter-offensive, his corps retreated into Austria, where it surrendered to the U.S forces.