Complex sentence: Before 2006 the team competed in the National Provincial Championship (NPC), with its best finishes coming in 1998 and 2000 when they came fourth over all, both times being knocked out in the semifinals.
Split into simpler sentences: Before 2006 the team competed in the National Provincial Championship (NPC). Its best finishes iin the NPC were in 1998 and 2000, when they came fourth over all, both times being knocked out in the semifinals.