Complex sentence: When ERCC3 was also cloned this led to a solution for DNA repair in XP-patients by inserting them in their fibroblasts, leading to an overall furthered the understanding of the nucleotide excision repair.
Split into simpler sentences: When ERCC3 was also cloned this led to a solution for DNA repair in XP-patients by inserting them in their fibroblasts. Leading to an overall furthered the understanding of the nucleotide excision repair.