Complex sentence: Her special delight was in violent exercise, mountain-climbing, fencing and fox-hunting, long walks and although she was quite twenty before she learnt to ride thoroughly, she became one of the most courageous and renowned horsewomen in Europe.
Split into simpler sentences: Her special delight was in violent exercise, mountain-climbing, fencing, fox-hunting and long walks. Although she was quite twenty before she learnt to ride thoroughly, she became one of the most courageous and renowned horsewomen in Europe.