Complex sentence: Today, many mobile DJs also promote themselves as event planners, organizers and MCs (master of ceremonies), working closely with their customers, guests and other vendors (such as venue staff and photographers/video graphs).
Split into simpler sentences: Today, many mobile DJ's also promote themselves as event planners, organizers and MCs (Master of Ceremonies). Working closely with their customers, guests and other vendors (such as venue staff and photographers/video graphs).