Complex sentence: In its tearoom Miss Marple encounters a childhood friend, Lady Selena Hazy, who admits she frequently recognizes people in the hotel only for them to turn out to be complete strangers.
Split into simpler sentences: In its tearoom Miss Marple encounters a childhood friend, Lady Selena Hazy. Lady Hazy admits she frequently recognizes people in the hotel only for them to turn out to be complete strangers.