Complex sentence: In 1953 and 1954 psychologists Roger Brown and Eric Lenneberg criticized Whorf for his reliance on anecdotal evidence, formulating a hypothesis to scientifically test his ideas, which they limited to an examination of a causal relation between grammatical or lexical structure and cognition or perception.
Split into simpler sentences: In 1953 and 1954 psychologists Roger Brown and Eric Lenneberg criticized Whorf's reliance on anecdotal evidence. They formulated a hypothesis to make Whorf's ideas scientifically testable, limiting it to examine a causal relation between grammatical or lexical structure and cognition or perception.