Complex sentence: Stepan Osipovich Makarov (--) was a famous Russian vice-admiral, a highly accomplished and decorated commander of the Imperial Russian Navy, and a distinguished oceanographer, awarded by the Russian Academy of Sciences, and author of several books.
Split into simpler sentences: Stepan Osipovich Makarov (--) was a Russian vice-admiral, a highly accomplished and decorated commander of the Imperial Russian Navy. He was also an oceanographer, awarded by the Russian Academy of Sciences, and author of several books.