Complex sentence: These problems are often overcome by averaging over many realizations of the same event; however, this method is unreliable with small data sets and undesirable when one does not wish to attenuate signal components that vary across trials.
Split into simpler sentences: These problems are often overcome by averaging over many realizations of the same event. However, this method is unreliable with small data sets and undesirable when one does not wish to attenuate signal components that vary across trials.