Complex sentence: She started her career at the Tunisian national TV then she joined Al Jazeera where she presented the talk show "Ishrakat" and later she became part of Al-Arabiya.
Split into simpler sentences: She started her career at the Tunisian national TV. She, then, joined Al Jazeera where she presented the talk show "Ishrakat" and later she became part of Al-Arabiya.