Complex sentence: Later, the rebels claimed that the NATO attacks helped them push out the loyalists from the city, however, by the evening there was no confirmation of the claim from reporters on the ground and shelling from the west of the town was still heard.
Split into simpler sentences: Later, the rebels claimed that the NATO attacks helped them push out the loyalists from the city. However, by the evening, there was no confirmation of the rebel claim from reporters on the ground and shelling from the west of the town was still heard.