Complex sentence: It was authored by a task force of 11 experts chosen by the APA, three of whom were also among the 52 signatories to "Mainstream Science on Intelligence", a similar though much shorter statement of expert opinion on intelligence research findings published in 1994.
Split into simpler sentences: It was authored by a task force of 11 experts chosen by the APA. Three of the experts were also among the 52 signatories to "Mainstream Science on Intelligence", a similar though much shorter statement of expert opinion on intelligence research findings published in 1994.