belief

You trust information more if it is presented clearly.

A 1999 study by Reber and Schwarz showed that cognitive fluency influences truth judgments.

The study, 'The processing fluency of truth', was published in 1999, not 2004.

Beauty and clarity influence your belief systems.

Where this comes from

Study: Reber and Schwarz, 1999, The processing fluency of truth
What the check found: The seminal 1999 paper by Reber and Schwarz is the correct source, not a 2004 study. The claim correctly identifies the authors but misstates the publication date and oversimplifies the psychological effect.
Confidence: Solid, with limits

One of these every day, and every one names the study it came from. When a finding is contested, it says so.