Complex sentence: Looking at the roster showed the inexperience of the team as many of the members did not have very good playoff successes with their respective clubs, and many of them had not represented their country before for an IIHF tournament.
Split into simpler sentences: Looking at the roster showed the inexperience of the team. Many of them did not have very good playoff successes, and many of them had not represented their country before for an IIHF tournament.