Complex sentence: Frank R. Frankenburger, a business man born in Fort Scott, Kansas, was the first "elected" mayor, he was elected in 1923, the first mayor who was chosen in "popularity" was Frank Bond, in 1907.
Split into simpler sentences: Frank R. Frankenburger, a business man born in Fort Scott, Kansas, was the first "elected" mayor; he was elected in 1923. The first mayor who was chosen in "popularity" was Frank Bond, in 1907.