Complex sentence: Their unusual morphology meant that they could not be comfortably included in "Distoma" so in 1856 Meckel von Helmsback created the genus "Bilharzia" for them.
Split into simpler sentences: Their unusual morphology meant that they could not be comfortably included in "Distoma". So in 1856 Meckel von Helmsback created the genus "Bilharzia" for them.