Translation:The children play with the wheel and the ball.
"Páistí ag imert le roth", yep, sounds about right, we're all poor as dirt here in Ireland! My mother could never afford 'toys' when we were kids. Those were only for posh children!
Pronunciation in the three main dialects can be found here: https://www.teanglann.ie/ga/fuaim/liathr%c3%b3id
The speaker for this Duolingo course is from northern Connacht.
The 'n' sound you're hearing at the beginning of the word is from the definite article 'an' directly preceding 'liathróid.'