Task: Text Simplification
Input (English): snRNPs ( pronounced " snurps " ) , or small nuclear ribonucleoproteins , are RNA-protein complexes that combine with unmodified pre-mRNA and various other proteins to form a spliceosome , a large RNA-protein molecular complex upon which splicing of pre-mRNA occurs .
Output (English): Small nuclear RNA ( snRNP , or ' snurps ' ) , joins with proteins to form spliceosomes .