Thank you for the offer to type the agreement in to the space provided but really one needs to read all the agreements together - the lease and the sub lease.  I would indeed be leery here and instead of agreeing to execute a sublease I would ask them to issue you a formal cancellation of your lease agreement and make sure that it is signed by all the necessary parties.  Then the new tenant can enter in to a lease agreement for the remainder of the leasehold.  I strongly suggest that you have some one read the documents on your behalf before you sign anything.  Good luck to you.