Complex sentence: She joined the media as a writer for the The Observer (Uganda) newspaper in Kampala but later on began a career in broadcasting with Urban Television, a member of New Vision Group until December 2014.
Split into simpler sentences: She joined the media as a writer for the The Observer (Uganda) newspaper in Kampala but later on began a career in broadcasting. Mariat then began working with Urban Television, a member of New Vision Group until December 2014.