Complex sentence: It is the UK's oldest independent cookery school, established in 1954 by the cookery writer Iris Syrett, and was the first school in the UK to offer a Cordon Bleu Diploma, which continues to be the backbone of Tante Marie's course structure today.
Split into simpler sentences: It is the United Kingdom's oldest independent cookery school, established in 1954 by the cookery writer Iris Syrett. It was the first school in the UK to offer a Cordon Bleu Diploma, which continues to be the backbone of Tante Marie's course structure today.