Complex sentence: Sir Francis "Frank" Joseph Kitts (1 May 1912--16 March 1979) was the longest-serving Mayor of Wellington, New Zealand, having held the post from 1956 to 1974.
Split into simpler sentences: Sir Francis "Frank" Joseph Kitts (1 May 1912--16 March 1979) was a New Zealand politician. He was the longest-serving mayor of Wellington, holding the post from 1956 to 1974.