Complex sentence: There is a dearth of documents for the early church in Sussex and gaps in the lists, and a lot of the documents that do survive are later copies or forgeries, which has made it impossible to reconstruct a detailed history before the Norman Conquest.
Split into simpler sentences: There is a dearth of documents for the early church in Sussex with gaps in the lists. Most of the documents that do survive are later copies or forgeries, which has made it impossible to reconstruct a detailed history before the Norman Conquest.