Complex sentence: Arnold led the Cougars to a 137-94 (.593) record, won three Western Athletic Conference basketball titles and also coached them to three trips to NCAA Tournament and another to the NIT.
Split into simpler sentences: Arnold led the Cougars to a 137-94 (.593) record and BYU won 3 Western Athletic Conference basketball titles while he coached them. He also coached the Cougars to three trips to NCAA Tournament and another to the NIT.