Complex sentence: It was music that had bonded Banahaw to Mamala, a half-mortal, and whenever Sarya sang, she would gather her lovely notes and melody inside her ornate alampay (shawl) and offer them to Banahaw.
Split into simpler sentences: It was music that had bonded Banahaw to Mamala, a half-mortal. Whenever Sarya sang, Mamala would appear to gather the maiden's plaintive notes and melodies inside her ornate alampay (shawl) and offer them to Banahaw.