Complex sentence: Maven is a frequent contributor to industry journals such as Genii, The Linking Ring, and MUM, and he has been the featured magician at the annual conventions of both the Society of American Magicians and the International Brotherhood of Magicians.
Split into simpler sentences: Maven is a frequent contributor to industry journals such as "Genii", "The Linking Ring", and "MUM". He has also been the featured magician at the annual conventions of both the Society of American Magicians and the International Brotherhood of Magicians.