Complex sentence: Since a fixed focus lens requires no input from the operator, it is suitable for use in cameras designed to be inexpensive, or operate without electrical power as in disposable cameras, or low-end 35 mm film cameras.
Split into simpler sentences: Since a fixed focus lens requires no input from the operator, it is suitable for use in cameras designed to be inexpensive, or operate without electrical power. Fixed-focus lenses are often used in disposable cameras, or low-end 35 mm film cameras.