Complex sentence: Partly as a result of that story, 21-year-old Jason was offered a job at Australia's Seven Network in Sydney where he worked between late 1983 and mid- 1985 as an on-air reporter for Seven News and its nightly current affairs show.
Split into simpler sentences: Partly as a result of that story, 21-year-old Jason was offered a job at Australia's Seven Network in Sydney. Between late 1983 and mid- 1985, he was an on-air reporter for Seven News and its nightly current affairs show.