Complex sentence: This specimen turned out to include a mixture of "Rubus plicatus" and "Rubus ulmifolius", from which the "Rubus plicatus" component was selected to be the type.
Split into simpler sentences: This specimen turned out to include a mixture of pieces that apparently belong to "Rubus plicatus" and "Rubus ulmifolius". From these, a component that appears to match "Rubus plicatus" was selected to be the type.