Complex sentence: It is the native format for several CAD packages including AutoCAD, IntelliCAD (and its variants), Caddie and DWG is supported non-natively Non-natively: i.e., the file format is supported by translation from or to another file formats.
Split into simpler sentences: It is the native format for several CAD packages including AutoCAD, IntelliCAD (and its variants) and Caddie. In addition, DWG is supported non-natively Non-natively: i.e., the file format is supported by translation from or to another file formats.