Complex sentence: In July 2014, EPA Region 10 proposed restrictions that would effectively prohibit the project, before the project had submitted its EIS, employing Section 404 (c) of the Clean Water Act as the basis of its proposal.
Split into simpler sentences: In July 2014, EPA Region 10 proposed restrictions that would effectively prohibit the project, before the project had submitted its EIS. Notably, the agency employed Section 404 (c) of the Clean Water Act as the basis of its proposal.