Complex sentence: There are a total of 174 Trappist monasteries worldwide (as of April 2011); only seven produce Trappist beer (six in Belgium and one in the Netherlands).
Split into simpler sentences: There are a total of 174 Trappist monasteries worldwide (as of April 2011). Of all these Trappist monasteries, only seven produce Trappist beer (six in Belgium and one in the Netherlands).