Complex sentence: Joe Jackson Sr. (1873--1942; born Joseph Francis Jiranek in Vienna, Austria) was an Austrian cycling champion and a member of a world champion bicycle polo team before he became an entertainer.
Split into simpler sentences: Joe Jackson Sr. (1873--1942) was born as Joseph Francis Jiranek in Vienna, Austria. He was Austrian cycling champion and a member of a world champion bicycle polo team before he became an entertainer.