Complex sentence: In 1979 an unformal group formed around Shlomo Kalo, known as "DAAT" (Hebrew acronym, meaning knowledge, standing for "know yourself always"), with a varying nuber of members or supporters till it disintegrated in 2009.
Split into simpler sentences: In 1979 an informal group known as "DAAT" (Hebrew acronym, meaning knowledge, standing for "know yourself always") formed around Shlomo Kalo. This group had a varying nuber of members or supporters till it disbanded in 2009.