Complex sentence: There are some alternative versions of the last verse, either mentioning the boatload of fish, or omitting it in more recent versions where the easier "Báidín Fheilimí is Feilimí ann" is used.
Split into simpler sentences: There are some alternative versions of the last verse, either mentioning the boatload of fish or omitting it. The latter is common in more recent versions, wherein the easier verse "Báidín Fheilimí is Feilimí ann" is used.