Generallythebattensseemtobesorawmanufacturedandoftencrookedandpre-bendthatcompetitionsailorshavetostartthetuningofthesailbysandingorchangingthemwithbetterones.

Please segment the words:
Generally the battens seem to be so raw manufactured and often crooked and pre-bend that competition sailors have to start the tuning of the sail by sanding or changing them with better ones.