Complex sentence: The same year an area of 99 square kilometres was notified as a SSSI designated as such the following year; in 1995, it was extended to cover the whole of the Ramsar site.
Split into simpler sentences: The same year an area of 99 square kilometres was notified as a SSSI designated as such the following year. In 1995, was extended to cover the whole of the Ramsar site.