Sentence 1: Type-3 worksharing is where the mailer's decision, whether or not he turns the mail over to a competitor, is influenced by factors other than the size of the discount and his cost of doing the work.

Sentence 2: Type-3 worksharing is when the mailer decides something is influenced by something other than the size of discount or his cost of work.

If the first sentence is true, then is the second sentence true?
yes