Complex sentence: The Stereo Realist camera, introduced in 1947, was the pioneer and when the surge arrived it was the most popular; its 5P (five film perforations per image) format was adopted as a standard by most other manufacturers, including Kodak.
Split into simpler sentences: The Stereo Realist camera, introduced in 1947, was the pioneer. Its 5P (five film perforations per image) format was adopted as a standard by most of its competitors, including Kodak.