Complex sentence: On Wirth's orders, he acquired a heavy gasoline engine in Lemberg; at least 200 horsepower, V-shaped, 8 cylinder, water-cooled motor identical to the one at Bełżec; disassembled from a Russian armoured vehicle or a tractor.
Split into simpler sentences: On Wirth's orders, he acquired a heavy gasoline engine in Lemberg. Its (minimum) 200 horsepower, V-shaped, 8 cylinder, water-cooled motor-identical to the one at Bełżec-was disassembled from a Russian armoured vehicle or a tractor.