And that discovery is important for any reader who desires to expand his horizons beyond the immediate here and now of thought and experience.

of thought and experience为介词短语作horizons的定语。为了突出、强调定语，介词短语后移到句末，即状语之后，形成分隔式定语。如果不强调定语，则为：

 And that discovery is important for any reader who desires to expand his horizons of thought and experience beyond the immediate here and now .