Complex sentence: He will work as an advisor on the RTÉ business desk and present a radio programme, "Mind Your Busine ss" on RTÉ Radio 1 on Saturday Mornings as a summer replacement for "The Business".
Split into simpler sentences: He will work as an advisor on the RTÉ business desk. He presented "Mind Your Business" on RTÉ Radio 1 on Saturday Mornings as a summer replacement for "The Business".