Original sentence: Four series were produced, all written by Bert Coules who had been the head writer on the complete canon project, with Andrew Sachs starring opposite Merrison
Edited sentence: Four series were made, all written by Bert Coules who had been the head writer on the complete canon project, with Andrew Sachs starring opposite Merrison.Sachs carried on the standard set by Michael Williams, portraying Watson as Conan Doyle set him down