A sentence like this is comforting because I feel that its absurd complexity relieves me of any obligation to understand it.

And during the period of twenty-one years from my death if the said Lilian Aspinall shall live so long to accumulate the surplus if any of such income at compound interest by investing the same and the resulting income thereof in any of the investments aforesaid by way of addition to the capital of such fund as aforesaid and so as to be subject to the same trusts as are hereby declared concerning the same and during the remainder of the life of the said Lilian Aspinall in case she shall survive the said period of twenty-one years to pay or apply such surplus income (if any) to the person or persons or for the purposes to whom and for which the same would for the time being be payable or applicable if the said Lilian Aspinall were then dead.
In Re Smith, England, 1928