Complex sentence: This may depict the diarist, or possibly her namesake and cousin, Lady Emily Harriet Pepys (1829--1891), author of a pair of tales for young people, who appears as a girl in the diary as "Emy" or "Emie".
Split into simpler sentences: This may depict the diarist, or possibly her namesake and cousin, Lady Emily Harriet Pepys (1829--1891), author of a pair of tales for young people. She appears in the diary as "Emy" or "Emie".