Complex sentence: It was the first commercially available microprocessor, providing a complete CPU on one chip, a feat made possible by the use of then new silicon gate technology allowing the integration of a higher number of transistors and a faster speed than was possible before.
Split into simpler sentences: It was the first complete CPU on one chip, and also the first commercially available microprocessor. Such feat of integration was made possible by the use of then new silicon gate technology allowing a higher number of transistors and a faster speed than was possible before.