Complex sentence: Ann Kristin Flatland debuted in the World Cup in 2003 in the finnish Kontiolahti, there she came 56th in the sprint event already in the second world cup weekend in Hochfilzen she debuted on the norwegian relay team who finished 5th.
Split into simpler sentences: Ann Kristin Flatland debuted in the World Cup in 2003 in the Finnish Kontiolahti, where she came in 56th in the sprint event. In the second world cup weekend in Hochfilzen she debuted on the Norwegian relay team who finished 5th.