Complex sentence: After the success of National Comics' new superhero characters Superman and Batman, Fawcett Publications started its own comics division in 1939, recruiting writer Bill Parker to create several hero characters for the first title in their line, tentatively titled "Flash Comics".
Split into simpler sentences: After the success of National Comics' new superhero characters Superman and Batman, Fawcett Publications in 1939 started its own comics division. Fawcett recruited writer Bill Parker to create several hero characters for the first title in their line, tentatively titled "Flash Comics".