ἄν τινων ἀφῆτε τὰς ἁμαρτίας, ἀφίενται αὐτοῖς· ἄν τινων κρατῆτε, κεκράτηνται.

1. ἄν
   would
2. τινων
   some
   of some, certain
3. ἀφῆτε
   you forgive
   allow
4. τὰς
   the
5. ἁμαρτίας
   sin
   sins
6.  
   ,
    
7. ἀφίενται
   they are forgiven
   they let go
8. αὐτοῖς
   to them
   them
9.  
   ·
    
10. ἄν
    would
11. τινων
    some
    of some, certain
12. κρατῆτε
    you hold
13.  
    ,
     
14. κεκράτηνται
    they have been held
    have been overcome
15.  
    .
     

If you forgive the sins of some, they are forgiven to them; if you hold the sins of some, they have been held.