Complex sentence: Biographers believe that Bacon was educated at home in his early years owing to poor health (which plagued him throughout his life), receiving tuition from John Walsall, a graduate of Oxford with a strong leaning toward Puritanism.
Split into simpler sentences: Biographers believe that Bacon was educated at home in his early years owing to poor health, which would plague him throughout his life. He received tuition from John Walsall, a graduate of Oxford with a strong leaning toward Puritanism.