Complex sentence: She began her bodybuilding career at Gibson's Gym in Washington, New Jersey and entered her first natural bodybuilding contest then entered a NPC show, the Women's Extravaganza, in 1999 at a weight of 120 lb., placing second in the Middleweight category.
Split into simpler sentences: She began her bodybuilding career at Gibson's Gym in Washington, New Jersey. She entered a NPC show, the Women's Extravaganza, in 1999 at a weight of 120 lb., placing second in the Middleweight category.