Complex sentence: Two legionary fortresses were established; one in Exeter in the southwest corner of the territory, one at Lincoln in the northeast, and a road, now known as the Fosse Way, established between the two to help control the border.
Split into simpler sentences: Two legionary fortresses were established; one at Isca (Exeter) in the southwest corner of the territory and the other at Lindum (Lincoln) in the northeast. A road, now known as the Fosse Way, was then established between the two to help control the border.