The somewhat awkward wording in the SEC filing tracks the langauge of the license agreement, which agreement was referenced in this post http://investorshub.advfn.com/boards/replies.aspx?msg=68499140. The license uses the phrase "upon termination of the *** period" .
I don't see the ambiguity and I think you may be confused by the double negative If another generic launches, the period during which a hybrid royalty/profit share terminates, or, as a normal person would say, the royalty switches from hybrid to pure royalty. If the period during which the hybrid is paid (or more precisely, payable) does not terminate prior to March 31, i.e., if there is no 3rd party generic launch, then MNTA has to pay the extra $15.