The end of a pixel strip is not special. If you cut a pixel strip somewhere, each part becomes a complete (but shorter) pixel strip. Each pixel is it’s own self-contained part.
So yes, you can cut a strip in half and hook them up in parallel.
You can also just fold it over and make it a zig-zag blade which lets you send different data to the pixels on one side than the pixels on the other side. Either will work, but obviously the zig-zag version requires a little extra programming.