Complex sentence: Spectrum analysis was then grouped by Kirchoff into the three fundamental laws commonly called Kirchoff's Laws, these laws integrated both Alter and Angstrom's discoveries of radiance and emission with Kirchoff's fundamental discoveries of absorption.
Split into simpler sentences: Spectrum analysis was then grouped by Kirchoff ino the three fundamental laws commonly called Kirchoff's Laws. These laws integrated both Alter and Angstrom's discoveries of radiance and emission with his fundamental discoveries of absorption.