Complex sentence: Peter Maurice Wright (9 August 191627 April 1995) was the principal scientific officer for MI5, the British counter-intelligence agency, noted for writing the controversial book "Spycatcher", which became an international bestseller with sales of over two million copies.
Split into simpler sentences: Peter Maurice Wright (9 August 191627 April 1995) was the principal scientific officer for MI5, the British counter-intelligence agency. His book "Spycatcher" became an international bestseller with sales of over two million copies.