sentence: He competed in the individual 15 km and 4 × 10 km relay events at the 1956 and 1960 Olympics and won two medals in 1960: a gold in the 15 km and a silver in the relay; in 1956 he placed fifth and fourth, respectively.
modified: fix grammar: He competed in the individual 15 km and 4 × 10 km relay events at the 1956 and 1960 Olympics and won two medals in 1960: a gold in the 15 km and a silvest in the relay; in 1956 he placed fifth and fourth, respectively.