Complex sentence: In 1894 Wood went to the Wagner festival at Bayreuth where he met the conductor Felix Mottl, who subsequently appointed him as his assistant and chorus master for a series of Wagner concerts at the newly built Queen's Hall in London.
Split into simpler sentences: In 1894 Wood went to the Wagner festival at Bayreuth, where he met the conductor Felix Mottl. As a result of that meeting, Mottl appointed him his assistant and chorus master for a series of Wagner concerts at the newly built Queen's Hall in London.