Complex sentence: He won the 50 km race at the Holmenkollen ski festival in 1959--1961, and in 1960 was awarded the Holmenkollen medal (shared with Helmut Recknagel, Sixten Jernberg, and Tormod Knutsen).
Split into simpler sentences: He won the 50 km at the Holmenkollen ski festival three straight years (1959,1960, and 1961). In 1960, Stensheim was awarded the Holmenkollen medal (Shared with Helmut Recknagel, Sixten Jernberg, and Tormod Knutsen).