Original sentence: The four contributors were Clement Freud, Kenneth Williams, Andre Melley and Nicholas Parsons.The structure of the first season in 1967 was slightly different.There were three panellists and a chairman, with the latter position 'rotating' each week and the previous incumbent joining the panel
Edited sentence: It's worth noting that the structure of the first season in 1967 was slightly different.The position of chairman would 'rotate' each week with the previous week's chairman joining the panel.There were three panelists and a chairman, Clement Freud, Kenneth Williams, Andre Melley and Nicholas Parsons