anacoluthon

‖n. [ Gr. &unr_;, &unr_;, not following, wanting sequence; 'an priv. + &unr_; following. ] (Gram.) A lack of grammatical sequence or coherence in a sentence; an instance of a change of construction in a sentence so that the latter part does not syntactically correspond with the first part.
Syn. -- anacoluthia [ 1913 Webster ]