撕破 is a resultative verb (V + result complement) meaning 'to tear something so that it becomes ripped or torn'. The first character 撕 provides the action (tear), and 破 indicates the result (broken/torn). It is transitive and often used with 把 or 被 to emphasize the object affected. You can also use it in potential complements like 撕得破 (can be torn) and 撕不破 (cannot be torn).