Complex sentence: Lord Mountcashel, Butler, Feilding, O'Brien and Dillon, were largely inexperienced and the French immediately disbanded Butler's and Feilding's, either incorporating their men into the remaining three regiments or sending them back to Ireland.
Split into simpler sentences: Lord Mountcashel, Butler, Feilding, O'Brien and Dillon. They were largely inexperienced and the French immediately disbanded Butler's and Feilding's, either incorporating their men into the remaining three regiments or sending them back to Ireland.