Complex sentence: The Go Large Plan was advertised with unlimited data usage and maximum speed, what was not clearly stated on advertisements, however, was that there was a fair use policy and traffic management that restricted users to a daily download limit.
Split into simpler sentences: The Go Large Plan was advertised with unlimited data usage and maximum speed. What was not clearly stated on advertisements, however, was that there was a fair use policy and traffic management that restricted users to a daily download limit.