Complex sentence: Three archaeological investigations between 1998 and 2005 provided more detail of the construction, and showed two distinct period of active use; although it is described as a chapel on the maps, there is no documentary or archaeological evidence to suggest that it had any religious function.
Split into simpler sentences: Three archaeological investigations between 1998 and 2005 provided more detail of the construction, and showed two distinct period of active use. Although it is described as a chapel on several maps, there is no documentary or archaeological evidence to suggest that it had any religious function.