Complex sentence: At North Texas, Slater is credited for having cultivated greater emphasis on small jazz combos and adding a master's degree in jazz, which, according to music journalist John Morthland, improved the overall quality of the lab bands.
Split into simpler sentences: At North Texas, Slater is credited for having cultivated greater emphasis on small jazz combos. According to music journalist John Morthland, the new degree improved the overall quality of the lab bands.