I've just read the old Irish tale called " Hudden and Dudden and Donald O' Neary ".It written by a pretty strange way. The word order is unusual so it was very hard to understand the sense.
This tale was about 3 neighbors, two of them had many lands and cattle, the third had little lands and a cow. However the first two killed a cow of the third to make him move away and leave his lands for them. But the third was more sneaky and fooled a couple of honest men, one of them was killed by his fault and made two his neighbors do a suicide. sembra naturale?

I've edited this carefully. I've placed my changes between asterisks (*). My comments are in square brackets ([ ]).

I've just read the old Irish tale called "Hudden and Dudden and Donald O' Neary". It*was* written *in* a pretty strange way. The word order is unusual so it was very hard to understand. [Leave out "the sense".]
This tale was about three neighbours. [full stop] Two of them had many lands and cattle, the third had *a small property" and a cow. However, [comma] the first two killed *the* cow of the third to make him move away and leave his *land* for them.
But the third was more sneaky and fooled a couple of honest men. [full stop] One of them was killed by his fault and made two his neighbours commit suicide.

I'm not sure what this last sentence means. Do you mean "He killed one of his neighbours and caused two more to commit suicide"?