Original sentence: In the purest form of fly-on-the-wall documentary-making, the camera crew works as unobtrusively as pussible; however, it is also common for participants to be interviewed, often by an off-camera voice
Edited sentence: In the purest form of fly-on-the-wall documentary-making, the camera crew works as unobtrusively as possible; however, it is also common for participants to be interviewed, often by an off-camera voice