Complex sentence: His condottieri Francesco Sforza and Vitelleschi in the meantime reconquered much of the Papal States: traditional Papal enemies such as the Prefetti di Vico were destroyed, while the Colonna were reduced to obeyance after the destruction of their stronghold in Palestrina (August 1436).
Split into simpler sentences: His condottieri Francesco Sforza and Vitelleschi in the meantime reconquered much of the Papal States. Traditional papal enemies such as the Prefetti di Vico were destroyed, while the Colonna were reduced to obedience after the destruction of their stronghold in Palestrina (August, 1436).