Complex sentence: Since then, Tariq and his men have returned several times to attack convoys, in a response, the army launched its latest onslaught after a suicide bomb attack at one of its bases near the tunnel six weeks ago.
Split into simpler sentences: Since then, Tariq and his men have returned several times to attack convoys. The army launched its latest onslaught after a suicide bomb attack at one of its bases near the tunnel six weeks ago.