Complex sentence: STL ("Standard Tessellation Language") is a file format native to the stereolithography CAD software created by 3D Systems of Valencia, CA, USA-although they are imported and exported by many other software packages.
Split into simpler sentences: STL ("Standard Tessellation Language") is a file format native to the stereolithography CAD software created by 3D Systems of Valencia, CA, USA. STL files are imported and exported by many other software packages.