Complex sentence: Either her father or, when coerced, her brother, spooned food into her mouth as quickly as possible, and if she choked or could not swallow fast enough it would be rubbed into her face.
Split into simpler sentences: Either her father or, when coerced, her brother, spooned food into her mouth as quickly as possible. If she choked or could not swallow fast enough, it would be rubbed into her face.