Complex sentence: This worries the girls as they see Hay Lin is not herself anymore, after Vincent kisses her on the cheek and pressures her to buy an instrument she doesn't want to Irma tries to confront her but fails.
Split into simpler sentences: This worries the girls, as they see Hay Lin is not herself anymore. After Vincent kisses her on the cheek and pressures her to buy an instrument she doesn't want, Irma tries to confront her but fails.