Alternatively, this is the original sentence with the embedded clauses moved to the end: > Each Party shall endeavor to ensure that energy-related activities m

Alternatively, this is the original sentence with the embedded clauses moved to the end: > Each Party shall endeavor to ensure that energy-related activities may be undertaken under the initial authorization and shall not require a new authorization, as long as these activities do not result in a facility exceeding its previously authorized capacity and are limited to performing maintenance work on, or ensuring the safety of, existing cross-border infrastructure. It is incredible how much clearer the sentence becomes with this simple change. The only part that remains even slightly challenging is "or ensuring the safety of".