οὗτος ἦλθεν εἰς μαρτυρίαν, ἵνα μαρτυρήσῃ περὶ τοῦ φωτός, ἵνα πάντες πιστεύσωσι δι᾽ αὐτοῦ.

1. οὗτος
   this
2. ἦλθεν
   came
3. εἰς
   into
   to
4. μαρτυρίαν
   testimony
5.  
   ,
    
6. ἵνα
   so that
7. μαρτυρήσῃ
   he might bear witness
   he might testify, might testify
8. περὶ
   about
   concerning
9. τοῦ
   of the
   the
10. φωτός
    light
11.  
    ,
     
12. ἵνα
    so that
13. πάντες
    all
14. πιστεύσωσι
    they believe
    they might believe
15. δι᾽
    through
16. αὐτοῦ
    his
17.  
    .
     

This one came for testimony, so that he might witness concerning the light, so that all might believe through him.