Ernest Gowers quotes:

Be clear, be brief, be human.

That it is a solecism to begin a sentence with 'and' is a faintly lingering superstition. The OED gives examples ranging from the 10th to the 19th c.; the Bible is full of them.

I was in favour of the death penalty, and disposed to regard abolitionists as people whose hearts were bigger than their heads. Four years of close study of the subject gradually dispelled that feeling. In the end I became convinced that the abolitionists were right in their conclusions...and that far from the sentimental approach leading into their camp and the rational one into that of the supporters, it was the other way about.