Complex sentence: Hadrosaur eggshell fragments are however present in two microfossil sites in the area, both of which are dominated by preserved shells of invertebrate life, primarily shells of pisidiids.
Split into simpler sentences: Hadrosaur eggshell fragments are however present in two microfossil sites in the area. Both of these sites are dominated by preserved shells of invertebrate life, primarily shells of pisidiids.