Complex sentence: Hearing that Angel's "sense of whimsy" has returned and that Giles seeks a spell to revoke his invitations, Jenny gives Buffy's Watcher a book she knows he doesn't have, then takes the opportunity to explain that she never meant to hurt anyone.
Split into simpler sentences: Hearing that Angel's "sense of whimsy" has returned and that Giles seeks a spell to revoke his invitations, Jenny gives him a book she knows he doesn't have. She then takes the opportunity to explain that she never meant to hurt anyone.