Complex sentence: His son-in-law Major R E Sankey was executor of his estate and after Benson's death, his collections were sent to Sylvanus Hanley, who removed the locality labels of all the specimens and destroyed its value.
Split into simpler sentences: His son-in-law Major R E Sankey was executor of his estate and after his death. His collections were sent to Sylvanus Hanley, who removed the locality labels of all the specimens thus decreasing its value.