Complex sentence: In that time Muller established himself as one of the most versatile journalist/hosts of his time, running the gamut from hard news anchor to feature segment host to newsmaker interviewer to fast-paced, fun-loving "tv personality".
Split into simpler sentences: In that time Muller established himself as one of the most versatile journalist/hosts of his time. His expertise runs the gamut from hard news anchor to feature segment host to news maker interviewer to fast paced, fun loving "tv personality".