Complex sentence: While peace negotiations were being held with Philip, towns threw out the last Leaguer stalwarts and any remaining Spanish garrisons, who offered minimal resistance, and finally Mercœur gave in; his submission to Henry at Angers was completed on 20 March 1598.
Split into simpler sentences: While peace negotiations were being held with Philip, towns threw out the last Leaguer stalwarts and any remaining Spanish garrisons, who offered minimal resistance. Finally Mercœur gave in; his submission to Henry at Angers was completed on 20 March 1598.