This verse in particular is what prompted me to think about it. NIV is either not clear or I just don't get it.
Eph 1:
NIV 10to be put into effect when the times will have reached their fulfillment—to bring all things in heaven and on earth together under one head, even Christ.
KJV 10That in the dispensation of the fulness of times he might gather together in one all things in Christ, both which are in heaven, and which are on earth; even in him:
NASB 10with a view to an administration suitable to (A)the fullness of the times, that is, (B)the summing up of all things in Christ, things in the heavens and things on the earth. In Him
TNIV 10 to be put into effect when the times reach their fulfillment—to bring unity to all things in heaven and on earth under Christ
HCSB 10 for the administration [a] of the days of fulfillment —to bring everything together in the Messiah, (A) both things in heaven and things on earth (B) in Him. (C)
ESV 10as a plan for(A) the fullness of time,(B) to unite all things in him, things in heaven and things on earth.