Complex sentence: Outright fraud was also advanced (firstly by George R. Price), and Soal spent much of the 30 years following his seemingly evidential studies defending them against fraud-hypotheses, and charges of methodological and statistical error.
Split into simpler sentences: Outright fraud was also advanced (firstly by George R. Price). So Soal spent much of the 30 years following his seemingly evidential studies defending them against these fraud-hypotheses, and charges of methodological and statistical error.