Complex sentence: PaintShop Pro (PSP) is a raster graphics editor and, later in the series, a vector graphics editor for computers running the Microsoft Windows operating system that was originally published by Minneapolis-based Jasc Software.
Split into simpler sentences: PaintShop Pro (PSP) was originally created as a raster graphics editor and became a vector graphics editor later in its series for computers running the Microsoft Windows operating system. It was originally published by Minneapolis-based Jasc Software.