Complex sentence: They are also a diverse group with tens of thousands described species; the largest social wasp being the Asian giant hornet, at up to in length; among the largest solitary wasps is the giant scoliid of Indonesia, "Megascolia procer".
Split into simpler sentences: They are also a diverse group with tens of thousands of described species. The largest social wasp is the Asian giant hornet, at up to in length; among the largest solitary wasps is the giant scoliid of Indonesia, "Megascolia procer".