Complex sentence: However, this signified the end of Hortense's position as King's favourite-though she and Charles remained friends, Louise de Keroualle was back to her role as "maitresse en titre".
Split into simpler sentences: However, this signified the end of Hortense's position as King's favourite. Though she and Charles remained friends, Louise de Keroualle returned to her role as "maitresse en titre".