Complex sentence: He also appeared in the MasterChef Australia (series 4) in the Offsite Challenge 6-the Sri Lankan Hindu wedding challenge, where he had to mentor the Red and Blue teams in their task to cook a traditional wedding banquet for 450 guests.
Split into simpler sentences: He also appeared in the MasterChef Australia (series 4) in the Offsite Challenge 6. In the Sri Lankan Hindu wedding challenge, he had to mentor the Red and Blue teams, where they had to cook a traditional wedding banquet for 450 guests.