Complex sentence: Though usually reserved and emotionally self-controlled ("I, Lucy Snowe, was calm"), she has strong feelings and affections for those she really values, and even sincerely cares for the giddy Ginevra, albeit in a blunt curmudgeonly fashion.
Split into simpler sentences: Though usually reserved and emotionally self-controlled, Lucy has strong feelings and affections for those whom she really values. She even sincerely cares for the giddy Ginevra, albeit in a blunt, curmudgeonly fashion.