Complex sentence: In spite of much documented success, PSI has not taken off massively, as higher education is still dominated by the "same pace, different learning" paradigm, and the number of new research publications about PSI gradually declined after a high in the 70's.
Split into simpler sentences: In spite of much documented success, PSI has not taken off massively. Education is still dominated by "same pace, different learning" approaches, and the number of new research publications about PSI gradually declined after a high in the 70's.