Complex sentence: A by-election for the Tokyo 10th district in the Japanese Japanese House of Representatives was held on 23 October 2016 to replace Yuriko Koike, who vacated the seat to contest the Tokyo gubernatorial election in July 2016.
Split into simpler sentences: A by-election for the Tokyo 10th district in the Japanese Japanese House of Representatives was held on 23 October 2016. The by-election was called after Yuriko Koike vacated the seat to contest the Tokyo gubernatorial election held in July 2016.