Complex sentence: The group demanded the release of Palestinian prisoners it claimed were being held in Britain, accused of killing Palestinian cartoonist Naji al-Ali in 1987, however, no-one linked to the murder was being held by UK authorities.
Split into simpler sentences: The group demanded the release of Palestinian prisoners it claimed were being held in Britain and who were accused of killing Palestinian cartoonist Naji al-Ali in 1987. No-one linked to the murder was being held by UK authorities.