Complex sentence: In the 1960s many fixed-lens 35mm rangefinder cameras for the amateur market were produced by several manufacturers, mainly Japanese, including Canon, Fujica, Konica, Mamiya, Minolta, Olympus, Ricoh, and Yashica.
Split into simpler sentences: In the 1960s many fixed-lens 35mm rangefinder cameras were offered by several manufacturers, mainly Japanese. Among them were Canon, Fujica, Konica, Mamiya, Minolta, Olympus, Ricoh, and Yashica.