Complex sentence: The North porch is single storey and retains its original door arch and windows while the two-storey 14th century South porch retains many of its original features but has a gabled front which was restored in the 19th century.
Split into simpler sentences: The North porch is single storey and retains its original door arch and windows. The two-storey 14th century South porch has a gabled front which was restored in the 19th century.