Complex sentence: This word has been applied vigorously to any former Roman provincials, including the Welsh, Italians, and French, and was borrowed by the Slavs who used it to refer to the Vlachs (Romanians).
Split into simpler sentences: This word has been applied widely to any former Roman provincials, including the Welsh, Italians, and French. The word was also borrowed by the Slavs who used it to refer to the Vlachs (Romanians).