Complex sentence: Benari also edited the periodical of HaKibbutz HaMeuchad (lit. the unified Kibbutz), an organization of kibbutzim, that periodical stemmed from Ein Harod's journal.
Split into simpler sentences: Benari also edited the periodical of HaKibbutz HaMeuchad (lit. the unified Kibbutz), an organization of Kibbutzim. That periodical stemmed from Ein Harod's journal.