Complex sentence: When young, it may be mistaken for the edible St Georges' mushroom ("Calocybe gambosa "), or miller ("Clitopilus prunulus") and has been responsible for many cases of mushroom poisoning in Europe.
Split into simpler sentences: When young, it may be mistaken for the edible St Georges' mushroom ("Calocybe gambosa ") or the miller ("Clitopilus prunulus"). It has been responsible for many cases of mushroom poisoning in Europe.