Original sentence: On June 19 1987 the Basque separatist group ETA planted a bomb in the basement of a Hipercor hypermarket in this avenue that killed 21 people
Edited sentence: 1987 Hipercor bombing.On 19 June 1987, the Basque separatist group ETA planted a bomb in the basement of a Hipercor hypermarket in this avenue that killed 21 people