Complex sentence: Initially equipped with Avro 504Ks and Ns for basic training it used Airco DH.9As, Bristol F2Bs and Sopwith Snipes for service training, the 504s were eventually replaced by the Avro Tutor and Armstrong Whitworth Siskins and Gloster Grebes replaced the Snipes.
Split into simpler sentences: Initially equipped with Avro 504Ks and Ns for basic training, it used Airco DH.9As, Bristol F.2Bs and Sopwith Snipes for service training. The 504s were eventually replaced by the Avro Tutor, whereas Armstrong Whitworth Siskins and Gloster Grebes replaced the Snipes.