Complex sentence: These stories of the time in Egypt have been especially important to the Coptic Church, which is based in Egypt, and throughout Egypt there are a number of churches and shrines marking places where the family stayed.
Split into simpler sentences: These stories of the time in Egypt have been especially important to the Coptic Church, which is based in Egypt. Throughout Egypt there are a number of churches and shrines that claim to mark an area where the family stayed.