Complex sentence: The Imperial Japanese army launched a major offensive into Guangxi province, with the objective to cut off Chinese supply route from French-controlled Vietnam, the elite Japanese 5th division spearheaded the Japanese offensive.
Split into simpler sentences: The Imperial Japanese army launched a major offensive into Guangxi province. With the objective to cut off the Chinese supply route from French-controlled Vietnam, the elite Japanese 5th division spearheaded the Japanese offensive.