Complex sentence: Browder's new character was codenamed "M.M." for several months for clearance issues, until it was decided to be "Cameron' Cam' Mitchell", with the callsign "Shaft", a pun on camshaft.
Split into simpler sentences: Browder's new character was codenamed "M.M." for several months for clearance issues. The character's name was eventually decided to be "Cameron'Cam' Mitchell", with the callsign "Shaft", a pun on camshaft.