Complex sentence: Although they believe that the absence of oval-trained open-wheel drivers is primarily to blame for the IRL's woes, it should be pointed out that USAC still runs sprint car races, mainly with developmental drivers, on a regular basis.
Split into simpler sentences: Although they believe that the absence of oval-trained open-wheel drivers is primarily to blame for the IRL's woes. It should be pointed out that the USAC still runs sprint car races, mainly with developmental drivers, on a regular basis.