Complex sentence: At the start 1935 Robey accepted his second Shakespearian role, Falstaff in "Henry IV, Part I", which caused much surprise in the press and some worry by his audiences that he might retire the Prime Minister of Mirth.
Split into simpler sentences: At the start 1935 Robey accepted his second Shakespearian role. The role was finally announced as Falstaff in "Henry IV, Part I", which caused much surprise in the press and a certain amount of worry to his audiences who thought that Robey was about to retire the Prime Minister of Mirth.