Complex sentence: A Matrox "DualBus" chip consists of twin unidirectional buses internally, each moving data into or out of the chip, which greatly increased the efficiency and bandwidth of data flow within the chip to each of the functional units.
Split into simpler sentences: A Matrox "DualBus" chip consists of twin unidirectional buses internally, each moving data into or out of the chip. This increases the efficiency and bandwidth of data flow within the chip to each of its functional units.