Complex sentence: A lowly tanner, painter and non-noble knight of Daventry (much like the young Sir Graham), who rises above his lowly status to save his kingdom and the world, becoming a great hero in the process.
Split into simpler sentences: A lowly tanner, painter and knight of Daventry (much like the young Sir Graham). Though not of noble birth, he rises above his lowly status to save his kingdom and the world, becoming a great hero in the process.