Complex sentence: Nixon initially wanted to refuse these requests completely, but St. Clair and other aides said such a stance of complete concealment would not be tenable politically; instead Nixon and his staff embarked on an approach of partial turnover with certain passages edited or removed.
Split into simpler sentences: Nixon initially wanted to refuse these requests completely, but St. Clair and other aides said such a stance of complete concealment would not be tenable politically. Instead Nixon and his staff embarked on an approach of turnover with certain passages edited or removed.