Complex sentence: He won four Ukrainian Championship titles (in 1950,1957,1958, and 1959) and shared first in the 1991 World Seniors' Championship, winning the title outright in 1992.
Split into simpler sentences: He won four Ukrainian Championship titles, in 1950,1957,1958, and 1959. He shared first in the 1991 World Seniors' Championship, and won the title outright in 1992.