Complex sentence: The king's sympathy for the Jewish collective came from an early age, as from he was recognized as king in 1214, he had a Jewish doctor named Açac Abenvenist at his disposal.
Split into simpler sentences: The king's sympathy for the Jewish collective came from an early age. From he was recognized as king in 1214, he had a Jewish doctor named Açac Abenvenist at his disposal.