Complex sentence: The Harkness table is a large, oval table used in a style of teaching, The Harkness Method, wherein students sit at the table with their teachers, is in use at many American boarding schools and colleges.
Split into simpler sentences: The Harkness table is a large, oval table used in a style of teaching, The Harkness Method, wherein students sit at the table with their teachers. This teaching method is in use at many American boarding schools and colleges.