Complex sentence: He is the regular fill-in news presenter for Natalie Barr, this said he presented the news on "Sunrise" live from the APEC Newsroom in the week leading up to APEC 2007 (3--7 September).
Split into simpler sentences: He is the regular fill-in news presenter for Natalie Barr. Amongst his duties on Sunrise, he presented the news on "Sunrise" live from the APEC Newsroom in the week leading up to APEC 2007 (3--7 September).