Oftentimes I purposed (πολλακις προεθεμην). Second aorist middle of προτιθημ, old verb to place, to propose to oneself, in N.T. only here, Romans 3:25; Ephesians 1:9. See Acts 19:21 for this purpose.

And was hindered (κα εκωλυθην). "But was hindered," adversative use of κα.

That I might have some fruit (ινα τινα καρπον σχω). Second aorist (ingressive), active of εχω, to have, and here means "might get (ingressive aorist) some fruit."