Note: this is an alternative to one previously posted. On reflection verse 18 is clearly the centre of the passage, although this means not trying to pair up “firstborn” in verse 14 and in verse 18 nor “through his blood” in verses 14 and 20, but it does pair “heaven” and “earth” in verses 16 and 20b. Notice the inversion of heaven and earth to earth and heaven – surely a clue given to see the structure. 

A. 13 Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son: 14 In whom we have redemption through his blood, even the forgiveness of sins: 15 Who is the image of the invisible God, the firstborn of every creature:

B. 16 For by (in) him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by (through) him, and for (in) him:

C. 17 And he is before all things, and by (in) him all things consist.

D. 18 And he is the head of the body, the ecclesia: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.

C’. 19 For it pleased the Father that in him should all fulness dwell; 20 And, having made peace through the blood of his cross, by (through) him to reconcile all things unto himself;

B’. by (through) him, I say, whether they be things in earth, or things in heaven.

A’. 21 And you, that were sometime alienated and enemies in your mind by wicked works, yet now hath he reconciled 22 In the body of his flesh through death, to present you holy and unblameable and unreproveable in his sight: 23 If ye continue in the faith grounded and settled, and be not moved away from the hope of the gospel, which ye have heard, and which was preached to every creature which is under heaven; whereof I Paul am made a minister;

Note: verse 16 also has chiastic structure

a. 16 For by (in) him

b. were all things created,

c. that are in heaven, and that are in earth,
visible and invisible,
whether they be thrones, or dominions,
or principalities, or powers:

b’. all things were created by (through) him,

a’. and for him: