Original: Khalid ibn al-Walid (Khalid son of al-Walid) was from the Meccan tribe of Quraysh, from a clan that initially opposed Muhammad. He played a vital role in the Meccan victory at the Battle of Uhud.
Simplified: Khalid ibn Walid was from the Meccan tribe of Quraysh, who opposed Muhammad, and he played a vital role in their victory at the Battle of Uhud.