Complex sentence: The consensus of modern archaeologists is that the Israelites were indigenous to Canaan and were never in Egypt, and if there is any historical basis to the exodus it can apply only to a small segment of the Israelites.
Split into simpler sentences: The consensus of modern archaeologists is that the Israelites were indigenous to Canaan and were never in Egypt. It therefore follows that if there is any historical basis to the exodus it can apply only to a small segment of the Israelites.