Complex sentence: Born to train driver Karl Wennström and Matilda Vilen, in 1935 he changed his surname from the Swedish "Wennström" to the Finnish "Verkkola".
Split into simpler sentences: Born to train driver Karl Wennström and Matilda Vilen. In 1935 he changed his surename from the Swedish "Wennström" into the Finnish "Verkkola".