Complex sentence: It first attacking Mosaddeq as 'an agent of American imperialism,'then gave him some support during and after the July 1952 uprising, including during difficulties in March 1953.
Split into simpler sentences: It first attacking him as 'an agent of American imperialism.'During and after the July 1952 uprising in support of Mosaddeq, it gave him some support and strengthened him during difficulties in March 1953.