Original sentence: Another important member of Batasuna is José Antonio Urrutikoetxea Bengoetxea, alias Josu Ternera, the main leader of ETA between 1987 and 1989 and accused of a number of assassinations like the massacre of 21 people at Hipercor - a shopping center in Barcelona
Edited sentence: Another important member of Batasuna is José Antonio Urrutikoetxea Bengoetxea, alias Josu Ternera, the main leader of ETA between 1987 and 1989 and accused of a number of assassinations like the 1987 Hipercor bombing which killed 21 people at Hipercor - a shopping center in Barcelona