Simplify the following text for a Grade 10 native English-speaking person.
Original: It emerged that the letters were forgeries written by journalist Richard Pigott , and Parnell was personally vindicated by the Parnell Commission in 1888-89 .
Simplified: They were forgeries written by journalist Richard Pigott . Parnell was personally shown to be innocent by the Parnell Commission in 1888-89 .