Complex sentence: The book is contained in a binder format, which allows the reader to add or remove sections as needed; the dictionary is complete, although it has concise format and for many items covered, there is no definition but instead a brief collection of relevant information.
Split into simpler sentences: The book is contained in a binder format, which allows the reader to add or remove sections as needed. For many items covered, the is no definition but instead a brief collection of relevant information.