Complex sentence: Hill's approach was criticised by one reviewer, Bill Muehlenberg, who says that, although the line between orthodoxy and heresy is "wobbly", theologians have the task of defining the parameters of theological orthodoxy.
Split into simpler sentences: Hill's approach was criticised by one reviewer, Bill Muehlenberg. Muehlenberg says that, although the line between orthodoxy and heresy is "wobbly", theologians have the task of defining the parameters of theological orthodoxy.