Complex sentence: It is a popular class of dinghy both with individuals and sailing schools offering a good introduction to high performance boats without being excessively hard to handle however, the 470 is most definitely not a suitable boat for the inexperienced.
Split into simpler sentences: It is a popular class of dinghy both with individuals and sailing schools offering a good introduction to high performance boats without being excessively hard to handle. However, the 470 is most definitely not a suitable boat for the inexperienced.