Complex sentence: The next series by APF was the futuristic space adventure "Fireball XL5" (1962) and it was the company's biggest success yet, becoming the first Anderson series sold to an American TV network, NBC-TV.
Split into simpler sentences: The next series by APF was the futuristic space adventure "Fireball XL5" (1962). It was the company's biggest success at the time, becoming the first Anderson series sold to an American TV network, NBC-TV.