I heard snoring can trigger harmful health and personality changes. Is this true?

Yes. Yes, snoring can indicate that people have obstructive sleep apnea (osa) and osa increases risk of hypertension, heart disease, stroke, obesity and depression.
Yes. Snoring can be associated with sleep apnea and this can result in poor sleep. Inadequate sleep is associated with many illnesses.
Yes. Snoring can be a symptom of sleep apnea. Untreated sleep apnea can also lead to depression and adhd-like symptoms.
Yes. Snoring is a common finding in obstructive sleep apnea. Due to poor sleep, irritability, somnolence and other characteristic changes may be manifest. Osa can also be complicated with high blood pressure, arryhtmias, pulmonary arterial hypertension, and long term with right sided heart failure.
Snoring and Behavior. If snoring is so severe, that is the airway is so severely blocked, this may disrupt quality of sleep. Both upper airway resistance syndrome and sleep apnea are two diagnoses that affect quality of sleep. Anything that regularly disrupts sleep quality, may affect behavior. Many children with add / adhd are found to have sleep apnea during sleep testing. Best way to know, have a sleep test.