Complex sentence: He was then cast as Shane Ramsey, a regular of new soap Neighbours on the Seven Network which began in 1985, he became one of the serial's most popular cast members, continuing in the series until 1987.
Split into simpler sentences: He was then cast as Shane, a regular of new soap "Neighbours" which began in 1985. As Shane Ramsay, he became one of the serial's most popular cast members, continuing in the series until 1987.