Maybe the language barrier is so high that he wouldn't understand her even if she explained it in detail. I've seen enoughposts on Chiebukuro with the opposite situation: Japanese girls asking for translations and interpretations of a message from their English-speaking boyfriend.
But yes, start out by telling us what part you don't get. If needed, we can give you a version of the sentence that has the various contractions expanded to their respective unabbreviated words.