Complex sentence: This effect was first described by J.M. Cattell (1886), and important contributions came from Reicher (1969) and was even further studied by Johnston and James_McClelland (1973).
Split into simpler sentences: This effect was first described by J.M. Cattell (1886), and important contributions came from Reicher (1969). It was further studied by Johnston and James_McClelland (1973).