Complex sentence: Prince Muhammad's mother, Al Jawhara bint Musaed Al Jiluwi was from the important Al Jiluwis family, which was in fact a cadet branch of the Al Saud family itself.
Split into simpler sentences: Prince Muhammad's mother was Al Jawhara bint Musaed Al Jiluwi. She was born into the important Al Jiluwis family, which was in fact a cadet branch of the Al Saud family itself.