Complex sentence: Since1961, more than 250people have been killed and over 600injured in terrorist attacks carried out by a variety of groups from the extreme right, extreme left, extreme Basque, Breton and Corsican nationalists, Algerian insurgent groups and Islamist extremists.
Split into simpler sentences: Since1961, more than 250people have been killed and over 600injured in terrorist attacks. France has a lengthy history of terrorist attacks carried out by a variety of groups from the extreme right, extreme left, extreme Basque, Breton and Corsican nationalists, Algerian insurgent groups and Islamist extremists.