"Must activate by expiration date on your Groupon, membership expires November 15th, 2013." What does that sentence mean? It seems like more than one thought is expressed. What does it mean to "activate by expiration date on your Groupon?" What exactly is "your Groupon?" What is the "expiration date on your Groupon" referring to exactly? I think I'm quite interested in this offer if only I could understand what it is. I find your English to be inexact. In part it is because you are trying to communicate two or more thoughts in a single sentence and you are using Groupon jargon that is unfamiliar to infrequent users like me.
Donald C. asked on Jul 11, 2013
Sorry for any confusion. Please activate this Groupon by presenting it upon your visit by Nov. 15, 2013. Your membership will be valid until Nov. 15. 2014.
Christina B. from Groupon replied on Jul 15, 2013