Complex sentence: He became a professor in the Military Academy, and he held that position from 1886 to 1895, only interrupted by the war against Bulgarians in 1889, after which he was appointed deputy chief of staff.
Split into simpler sentences: He became a professor in the Military Academy, holding that position from 1886 to 1895. His post was only interrupted by the war against Bulgarians in 1889, after which he was appointed Deputy Chief of Staff.