Complex sentence: All of the snRNPs together contribute five RNAs and about 50 proteins to the core spliceosomePrp8 makes up part of the U5 snRNP and the U5-U4/U6 tri-snRNP.
Split into simpler sentences: All of the snRNPs together contribute five RNAs and about 50 proteins to the core spliceosome. The Prp8 gene encodes for a protein that is a central part of the U5 snRNP and the U5-U4/U6 tri-snRNP.