Complex sentence: Barker married his high school sweetheart Dorothy Jo Gideon on January 12,1945, and the couple remained married for 36 years, until her death on October 19,1981 of lung cancer.
Split into simpler sentences: Barker married his high-school sweetheart Dorothy Jo Gideon on January 12,1945. They remained married for 36 years until her death on October 19,1981 of lung cancer.