Complex sentence: Jafna bin Amr and his family, headed for Syria where he settled and initiated the kingdom of the Ghassanids who was so named after a spring of water where they stopped on their way to Syria.
Split into simpler sentences: Jafna bin Amr and his family headed for Syria, where he settled and initiated the kingdom of the Ghassanids. They were so-named after a spring of water where they stopped on their way to Syria.