Reddit reviews The Orthodox Church: An Introduction to Eastern Christianity

• The Orthodox Faith, by Fr. Thomas Hopko, is online and free.
  
  
• The Orthodox Church and The Orthodox Way, by Metropolitan Kallistos Ware, are a pair of very good introductory books.
  
  
• Introducing Eastern Orthodox Theology by Fr. Andrew Louth, is another good theological introduction.

Do you mean fro.a historical context or an Eastern Orthodox context? If the former, try The Eastern Churches and the Papacy. If the latter, try The Orthodox Church by Timothy Ware.

Also, these two books by Timothy (Kallistos) Ware https://www.amazon.com/Orthodox-Way-Kallistos-Ware/dp/0913836583 and https://www.amazon.com/gp/aw/d/014198063X/ref=mp_s_a_1_1?ie=UTF8&qid=1480292564&sr=8-1&pi=SY200_QL40&keywords=the+orthodox+church&dpPl=1&dpID=51exHD4f7sL&ref=plSrch are relatively easy to read and give a good summary of church doctrine and history.

The Orthodox Church: An Introduction to Eastern Christianity https://www.amazon.com/dp/014198063X/ref=cm_sw_r_cp_api_i_HmxhDbPXC5MRX

Always a good Book to start with!

Not so much a history as a theological primer and an introduction to the church. The Orthodox Church, of which a new edition released about a month ago, by the same author is the history book companion to The Orthodox Way.

I haven't found anything yet that is a good in-depth narrative of the split. At a high-level, it happened over several centuries and was driven by geographic separation, linguistic and cultural differences (Greek vs. Latin), the Pope's claim to primacy, the rise of icons in the eastern church, and the western church's addition of the Filioque clause to the Nicene creed. Honestly, Wikipedia has some good stuff (search for "The Great Schism" and "Filioque") for an introduction to the issues.

The Orthodox Church touches on the issues from an eastern perspective and is a great introduction to Eastern Orthodoxy.

Christianity: The First Three Thousand Years is a great single-volume work covering many aspects of church history. It's a large book, but a great place to start if you're a history buff.