英语语法分析

The Continuity IRA said it had murdered Mr Carroll: intermittently active for 15 years, the group is known for having organised the odd riot in Craigavon.

“不懈的北爱尔兰共和军”（该组织间断地活跃了15年，挑起过克雷加文区的骚乱）则称对卡罗尔警官的死负责。

Forty-eight hours later Stephen Carroll, a police constable with less than two years to go until retirement, was shot in the head when he answered a call for help in Craigavon.

48小时后，还有不到两年就退休的警员斯蒂芬·卡罗尔，在接听克雷加文区的来电时被射中头部。