Complex sentence: He's known as "the trainer's trainer" as he specializes in training those who train others.1 He is a champion for participant-centered training where instructors facilitate learning through the use of hands-on, interactive lessons.
Split into simpler sentences: He's known as "the trainer's trainer" as he specializes in training those who train others. T&D Magazine, January 2008 He is a champion for participant-centered training where instructors facilitate learning through the use of hands-on, interactive lessons.