Complex sentence: Pickard, circling at, saw prisoners escape, signalled No.21 Squadron's Mosquitos to return home, and as he turned for home, a Fw 190 fighter of JG 26 severed the tail of his Mosquito, the resulting crash killing him and his navigator.
Split into simpler sentences: Pickard, circling at, saw prisoners escape and signalled No.21 Squadron's Mosquitos to return home. As he turned for home, a Fw 190 fighter of JG 26 severed the tail of his Mosquito; the Mosquito's crash killed him and his navigator.