Complex sentence: Debuting at the 1994 Winter Olympics in Lillehammer at the age of 15, he took his first medal three years later at the age of 18 when he won silver in the 4 x 5 km team event at the FIS Nordic World Ski Championships.
Split into simpler sentences: Debuting at the 1994 Winter Olympics in Lillehammer at the age of 15, he took his first medal. Three years later at the age of 18 when he won silver in the 4 x 5 km team event at the FIS Nordic World Ski Championships.