Complex sentence: He objected to Austrian annexation of the land recently under Napoleon's control, because this would make the local people distrust the allied force, and the Austrians rejected many of Kutuzov's proposals.
Split into simpler sentences: He objected to Austrian annexation of the land recently under Napoleon's control, because this anexation would make the local people distrust the allied force. In turn, the Austrians rejected many of Kutuzov's proposals.