Simplify the following text for a Grade 9 native English-speaking person.
Original: Collins , along with Richard Mulcahy and Eoin O'Duffy decided on a series of seaborne landings into republican held areas that re-took Munster and the west in Julyâ `` August 1922 .
Simplified: Collins , along with Richard Mulcahy and Eoin O'Duffy decided on a series of seaborne landings into republican held areas . They re-took Munster and the west in Julyâ `` August 1922 .