Complex sentence: Valto Rudolf Olenius (12 December 1920 in Karkkila--13 July 1983 in Heinola) was a Finnish pole vaulter who competed in the 1948 Summer Olympics and in the 1952 Summer Olympics.
Split into simpler sentences: Valto Rudolf Olenius (12 December 1920 in Karkkila--13 July 1983 in Heinola) was a Finnish pole vaulter. He has competed in the 1948 Summer Olympics and in the 1952 Summer Olympics.