Complex sentence: After COINTELPRO became public in 1977, and the Freedom of Information Act was passed in 1978, Rice and Poindexter were able to access their FBI files, which were each over a thousand pages long, although they only received small portions upon request.
Split into simpler sentences: After COINTELPRO became public (in 1977) and the Freedom of Information Act was passed (in 1978), Rice and Poindexter were able to access their FBI files. Each file was over a thousand pages long, though they only received small portions upon request.