Simplify the following text for a Grade 6 native English-speaking person.
Original: The Phoenix Park Murders were the fatal stabbings on 6 May 1882 in the Phoenix Park in Dublin of Lord Frederick Cavendish and Thomas Henry Burke .
Simplified: The Phoenix Park Murders were the fatal stabbings on 6 May 1882 in the Phoenix Park in Dublin . Lord Frederick Cavendish and Thomas Henry Burke were killed .