Complex sentence: It involves the systematic analysis and investigation of human and animal behaviour through controlled and naturalistic experimental observations and rigorous formulations (E. D. Klemke, R. Hollinger, and A. D. Kline, (ed) (1980)).
Split into simpler sentences: It involves the systematic analysis and investigation of human and animal behaviour through controlled and naturalistic observation. Its done through rigorous formulations (E. D. Klemke, R. Hollinger, and A. D. Kline, (ed) (1980)).