Complex sentence: On June 28, the group threatened to execute him if Israel did not suspend its current excursion into the Gaza Strip, which is in response to the kidnapping of Isreali Defense Forces (IDF) soldier Gilad Shalit.
Split into simpler sentences: On June 28, the group threatened to execute him if Israel did not suspend its current excursion into the Gaza Strip. The Isreali excursion is in response to the kidnapping of Isreali Defense Forces (IDF) soldier Gilad Shalit.