Complex sentence: Their most common hosts are insects belonging to the order Hemiptera (true bugs), especially Auchenorrhyncha (leafhoppers, cicadas, and allies) and Coccoidea (scale insects), but this might be because these groups are simply better studied.
Split into simpler sentences: Their most common hosts are insects belonging to the order Hemiptera (true bugs), especially Auchenorrhyncha (leafhoppers, cicadas, and allies) and Coccoidea (scale insects). But this might be because these groups are simply better studied.