Whilst you probably can "convert" JPS to JPG format, you probably will get the exact same image and not some kind of merged version of the 3D image. So ultimately, this conversion is pointless.
Convert Stereoscopic JPEG format to JPEG bitmap image format.
We have found 2 software records in our database eligible for .jps to .jpg file format conversion.
Microsoft Windows software - convert jps to jpg on Windows
A 3D-photo viewer, editor and batch processor
Convert from jps file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jps to jpg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Multiplatform software - convert jps to jpg on any platform
A popular utility for viewing and converting graphic files