Complex sentence: When the station closed in 1991 the frequencies continued to relay Radio Wales and from 1999 Radio Wales has been acquiring its own FM network, starting in areas like Cardiff and Wrexham where the Welsh language has the fewest speakers.
Split into simpler sentences: When the station closed in 1991 the frequencies continued to relay Radio Wales. Since 1999 Radio Wales has been expanding its FM network, starting in areas like Cardiff and Wrexham where the Welsh language has the fewest speakers.