Complex sentence: Trudeau has been with the CBC since 1979 as a host CBC Radio for eight years hosting the local show "Daybreak" before becoming a national radio host fronting "As It Happens" and "Cross-Country Checkup" during the 1980s.
Split into simpler sentences: Trudeau has been with the CBC since 1979 as a host. For eight years he hosted the local show "Daybreak" on CBM before becoming a national radio host fronting "As It Happens" and "Cross-Country Checkup" during the 1980s.