Complex sentence: The Fifth Ecumenical Council (the Second Council of Constantinople) was a Christian Ecumenical Council that was held at Constantinople (5 May-2 June, 553), having been called by Emperor Justinian.
Split into simpler sentences: The Fifth Ecumenical Council (the Second Council of Constantinople) was a Christian Ecumenical Council that was held in 553. This council was held at Constantinople (5 May-2 June, 553), having been called by Emperor Justinian.