Complex sentence: Suddenly Uncle Paton notices that charlie is following him and tells Charlie to go home, later that day Charlie's great-aunts, Venetia, Lucretia and Eustacia Yewbean, and his grandmother Grizelda Bone, test Charlie to see if he is magically endowed.
Split into simpler sentences: Suddenly Uncle Paton notices that Charlie is following him and tells Charlie to go home. Later that day Charlie's great-aunts, Venetia, Lucretia and Eustacia Yewbean, and his grandmother Grizelda Bone, test Charlie to see if he is magically endowed.