Complex sentence: During this time official accusations were brought against him of excesses in his treatment of the native population, and after three investigations had been held he was, in 1897, deprived of his commission for misuse of official power losing all his pension benefits.
Split into simpler sentences: During this time official accusations were brought against him of excesses in his treatment of the native population. After three investigations had been held Peters was, in 1897, deprived of his commission for misuse of official power losing all his pension benefits.