Complex sentence: However, Pena pulled out of the bout after suffering an injury to her right knee she suffered the injury while grappling in training, ultimately damaging, among other aspects, her ACL, MCL, LCL and meniscus.
Split into simpler sentences: However, Pena pulled out of the bout after suffering an injury to her right knee. She suffered the injury while grappling in training, ultimately damaging, among other aspects, her ACL, MCL, LCL and meniscus.