Complex sentence: When Marta finished C.O.U., she went to work as a receptionist at a production company and everyone liked her so much she decided to study a higher level training cycle, audiovisual production, radio shows and so she could get jobs at the company where she worked.
Split into simpler sentences: When Marta finished C.O.U., she went to work as a receptionist at a production company. Everyone liked her so much that she decided to study audiovisual and radio production so she could get higher level jobs at the company where she worked.