Complex sentence: Stepan Andriyovych Bandera (1 January 1909--15 October 1959) was a Ukrainian politician and one of the leaders of the Ukrainian nationalist movement in Western Ukraine which fought for Ukrainian independence.
Split into simpler sentences: Stepan Andriyovych Bandera (1 January 1909--15 October 1959) was a Ukrainian politician and one of the leaders of Ukrainian national movement in Western Ukraine. Bandera the leader of the Ukrainian nationalist movement which fought for Ukrainian independence.