Complex sentence: The IDF used cluster bombs provided by the United States, which, according to U.S. President Jimmy Carter, violated the legal agreement between Israel and the U.S. because the weapons had been provided for defensive purposes against an attack on Israel.
Split into simpler sentences: The IDF used cluster bombs provided by the United States. According to U.S. President Jimmy Carter, this use of the cluster bombs violated the legal agreement between Israel and the U.S. because the weapons had been provided for defensive purposes against an attack on Israel.