Complex sentence: The warpaint shiner is not a valued sport or pan fish and the population is relatively stable in most of its range, the management measures necessary to preserve these fish are beneficial not only to the warpaint shiner but to a myriad of stream dwelling fishes.
Split into simpler sentences: The warpaint shiner is not a valued sport or pan fish and the population is relatively stable in most of its range. The management measures necessary to preserve these fish are beneficial not only to the warpaint shiner but to a myriad of stream dwelling fishes.