Complex sentence: The first meeting of Philip of Hesse with Martin Luther took place in 1521, aged 17, at the Diet of Worms, where he was attracted by Luther's personality, though he had at first little interest in the religious elements of the gathering.
Split into simpler sentences: The first meeting of Philip of Hesse with Martin Luther took place in 1521, at the age of 17, at the Diet of Worms. There he was attracted by Luther's personality, though he had at first little interest in the religious elements of the gathering.