Complex sentence: Since Australia left the OFC to join the AFC in 2006, competition between the two teams has been less regular, though the rivalry between the two teams is still strong, with the occasional match receiving much media and public attentions.
Split into simpler sentences: Since Australia left the OFC to join the AFC in 2006, competition between the two teams has been less regular. Although the rivalry between the two teams is still strong, with the occasional match receiving much media and public attentions.