"We can hardly conclude even so desultory
a survey of grammatical misdemeanours as this has been without mentioning
the most notorious of all. The anacoluthon is a failure
to follow on, an unconscious departure from the grammatical scheme
with which a sentence was started, the getting switched
off, imperceptibly to the writer, very noticeably to his readers, from
one syntax track to another. There is little to be said
on the matter."
From The King's English
By H.W. Fowler and F.G. Fowler (1931)