Complex sentence: In 1969 he contributed with Amis to the so-called "Black Papers" on British education, they wrote a series of polemic attacks on the "permissive" standards of the time, as in their opinion standards of learning were being eroded.
Split into simpler sentences: In 1969 he contributed with Amis to the so-called "Black Papers" on British education. They wrote a series of polemic attacks on the "permissive" standards of the time, as in their opinion standards of learning were being eroded.