Original sentence: Meibion Glyndwr or Sons of Glyndwr was a Welsh Nationalist movement responsible for setting fire to English-owned holiday home in Wales from 1979 to the mid 1990s.The group first came to prominence in 1979
Edited sentence: It came to prominence in the 1970s with Alwyn Jones and George Taylor blowing themselves up planting a bomb on the railway line to be used by Charles Mountbatten-Windsor on his way to his investiture as Prince of Wales.Meibion Glyndwr or Sons of Glyndwr was a Welsh Nationalist terrorist movement.This was the most well-known single act by the group; however, the group consistently set fire to English holiday homes in the coastal resorts of West Wales starting in 1979