Complex sentence: The new ETX 3.0 specification offers all of the benefits of the original ETX standard while adding in 2x Serial ATA without changing any of the ETX pins, making new modules 100 percent pin-to-pin compatible with previous versions.
Split into simpler sentences: The new ETX 3.0 specification offers all of the benefits of the original ETX standard while adding 2 Serial ATA interfaces. This is done without changing any of the ETX pin designations, making new modules 100 percent pin-to-pin compatible with previous versions.