Complex sentence: Daystar tells Shiara about his quest, and she decides to accompany him, but when Daystar shows Shiara his sword and they both touch it together, they both feel a surprising jolt.
Split into simpler sentences: Daystar tells Shiara about his quest, and she decides to accompany him. Afterwards, when Daystar shows Shiara his sword and they both touch it together, they feel a surprising jolt.