Complex sentence: However, despite having sparkling line-ups, their performance fluctuated, ending up winning "only" Finnish bronze in 1998 and silver in 2000, and repeatedly having no success in European Hockey League (which turned out as a major flop in itself).
Split into simpler sentences: However, despite having sparkling line-ups, their performance fluctuated, ending up winning "only" Finnish bronze in 1998. The club went on to making a losing appearance in the finals in 2000, and repeatedly failed to achieve success in the European Hockey League (which turned out as a major flop in itself).