Original sentence: The Katyusha proved to be an effective weapon and became a mainstay of the insurgency in South Lebanon.The newfound unity among these Shi'a insurgent groups in 1985 has been credited to the disappearance of Musa al-Sadr
Edited sentence: The Katyusha proved to be an effective weapon and became a mainstay of the resistance in South Lebanon.The newfound unity among these Shi'a resistance groups in 1985 has been credited to the disappearance of Musa al-Sadr