Does A而B且C mean "A and B and C"?
"A而B且C" means A and B and C. We use "A而B且C" instead of "A且B且C" simply due to the reason that we do not want to use the same word twice in the phrase. 

"既","且"，“而” can all mean "and", while sometimes, the word "而" can means "but" (when "而" is used alone to link two sentences). One thing for sure is that in the form of "既A且B" and "A而B且C", they all mean "and".