Complex sentence: After a series of unsuccessful retaliatory infiltrations by existing IDF units, in the summer of 1953 Ben Gurion pressed Chief of Staff Mordechai Maklef to establish such a special forces unit, Israel's first, and reservist Ariel Sharon was called back to duty.
Split into simpler sentences: After a series of unsuccessful retaliatory infiltrations by existing IDF units, Ben Gurion pressed Chief of Staff Mordechai Maklef to establish such a special forces unit in the summer of 1953. This was Israel's first, and reservist Ariel Sharon was called back to duty.