"神像兽形化" can be translated as "the transformation of divine statues into beastly forms" or more concisely as "divine statues taking on beastly shapes" depending on the context and intended nuance.
"Transformation of divine statues into beastly forms" emphasizes the process of change.
"Divine statues taking on beastly shapes" focuses more on the resulting appearance.
Choose the one that best fits your specific context.