Complex sentence: A return to Paris from Italy in 1855 was followed by better health and the provision of exclusive musical and culinary soirées during which he presented salon music in the form of songs, piano pieces and small chamber ensembles that he called "Sins of Old Age".
Split into simpler sentences: A return to Paris from Italy in 1855 was followed by better health and the provision of exclusive musical and culinary soirées. During these, he presented salon music in the form of songs, piano pieces and small chamber ensembles that he called "Sins of Old Age".