Complex sentence: Barmat started a trade in food supplies, which yielded him much money; he moved his enterprise to Amsterdam and founded in 1913 the "Holland-Balkan Handelsvereeniging" (Holland-Balkan Trade Company) with several agencies at the Balkan.
Split into simpler sentences: Barmat started a trade in food supplies, which yielded him much money. Barmat moved his enterprise to Amsterdam and in 1913 founded the "Holland-Balkan Handelsvereeniging" (Holland-Balkan Trade Company) with several agencies at the Balkan.