The phrase "was determined by" is often used to describe how something was decided or influenced. There are a variety of synonyms that can be used in place of this phrase, depending on the context and tone of the sentence. Some alternatives include "was influenced by," "was shaped by," "was decided by," "was controlled by," and "was regulated by." Each of these synonyms emphasizes a different aspect of the decision-making process, from external influences to internal factors. Choosing the right synonym can help to convey a specific meaning or tone to a sentence, making it more effective and memorable.