Complex sentence: The electronics manufacturing industry has developed a specialized specification limit known as the Process Window Index (PWI), which provides a quantifiable and reproducible measure of how well a thermal profile performs relative to critical process limits, expressed as a percentage.
Split into simpler sentences: The electronics manufacturing industry has come up with a specialized specification limit known as the Process Window Index (PWI). The Process Window Index provides a quantifiable and reproducible measure of how well a thermal profile performs relative to critical process limits, expressed as a percentage.