Complex sentence: As six members of Hamas were killed, it considered this attack a "massive breach of the truce," and rocket attacks towards Israeli cities around Gaza increased sharply in November 2008, approaching the pre-truce levels.
Split into simpler sentences: As six members of Hamas were killed, it considered this attack a "massive breach of the truce". Rocket attacks towards Israeli cities around Gaza increased sharply in November 2008, approaching the pre-truce levels.