Complex sentence: WWE.com placed a disclaimer on their monthly schedule (before removing the week by week calendar schedule altogether) that "programs and air dates vary by cable provider" and have set up an email address on the 24/7 subsite to report "missing content".
Split into simpler sentences: WWE.com placed a disclaimer on their monthly schedule (before removing the week by week calendar schedule altogether) that "programs and air dates vary by cable provider". They have set up an email address, accessible from the 24/7 subsite, to report any "missing content".