Original sentence: On 27 November 1975, McWhirter was assassinated by two IRA terrorists, both of whom were members of what became known as the Balcombe Street Gang, the group for whose capture McWhirter had offered the reward
Edited sentence: On 27 November 1975, McWhirter was assassinated by two IRA volunteers, both of whom were members of what became known as the Balcombe Street Gang, the group for whose capture McWhirter had offered the reward