Complex sentence: A few discoveries have been made in Argory and Peatlands in the late 1990s and they have also been rediscovered at Rostrevor Before this time the moth had not been seen since the early part of the twentieth century and sightings still remain relatively rare.
Split into simpler sentences: A few discoveries have been made in Argory and Peatlands in the late 1990s. They have also been rediscovered at Rostrevor Before this time the moth had not been seen since the early part of the twentieth century and sightings still remain relatively rare.