Complex sentence: Rudge devised a test to seek out the genuine from the merely curious, she would ask the prospective visitor to recite a line from one of Pound's works: those that could gained admittance; those that could not were shown out.
Split into simpler sentences: Rudge devised a test to seek out the genuine from the merely curious. She would ask the prospective visitor to recite a line from one of Pound's works: those that could gained admittance; those that could not were shown out.