Complex sentence: These concepts were further developed in the books Total Quality Improvement (1996) and The Essential Guide to Developing Your Staff (1998), the latter containing practical advice and case studies.
Split into simpler sentences: These concepts were further developed in the books Total Quality Improvement. Piatkus books, 1996 and The Essential Guide to Developing Your Staff, Piatkus books, 1998, the latter containing practical advice and case studies.