Complex sentence: After Homans founded the theory, other theorists continued to write about it, particularly Peter M. Blau and Richard M. Emerson, who in addition to Homans are generally thought of as the major developers of the exchange perspective within sociology.
Split into simpler sentences: After Homans founded the theory, other theorists continued to write about it. Nevertheless, George C. Homans, Peter M. Blau and Richard M. Emerson generally are thought of as the major developers of the exchange perspective within sociology.