Complex sentence: A revised edition was published in 1974 as the WISC-R (Wechsler, 1974), featuring the same subtests however the age range was changed from 5-15 to 6-16.
Split into simpler sentences: A revised edition was published in 1974 as the WISC-R (Wechsler, 1974), featuring the same subtests. However, the age range was changed from 5-15 to 6-16.