Complex sentence: The organization has fought to keep information about itself confidential, and opposed amendments to the Canada Elections Act that would have required third-party organizations like the NCC to publish the names of all contributors donating more than $250.
Split into simpler sentences: The organization has fought to keep information about itself confidential. The NCC opposed proposed amendments to the "Canada Elections Act" that would have required third-party organizations like the NCC to publish the names of all contributors donating more than $250.