Complex sentence: Le Brun imprinted his own character on all that was produced in France during his lifetime, he was the originator of "Louis XIV Style" and gave a direction to the national tendencies which endured centuries after his death.
Split into simpler sentences: Le Brun imprinted his own character on all that was produced in France during his lifetime. He was the originator of "Louis XIV Style" and gave a direction to the national tendencies which endured centuries after his death.