Some translations set each line of poetry farher to the right than the rest of the text to make it easier to read. The ULB does this with the poetry in this chapter.
Scripture frequently uses the imagery of farming in reference to spiritual matters. The statement "You have sown much seed, but bring in little harvest" indicates that they had done a lot but have very little to show for it. (See: [[rc://en/tw/dict/bible/kt/spirit]] and [[rc://en/tw/dict/bible/other/seed]])