Complex sentence: Her first TV appearance was on October 7,1997 on a local TV station, but her career took off and at the age of 22, when she was hired by major open TV station RCTV to host several shows.
Split into simpler sentences: Her first TV appearance was on October 7,1997. She started her career with a local TV station, and at the age of 22 her career took off when she was hired by RCTV to host several shows.