Complex sentence: Kemco's and other companies' games starring Disney characters were changed to non-Disney licences when released outside of Japan, specifically in the United States because Capcom had exclusive rights to the Disney property in the US at the time.
Split into simpler sentences: Kemco's and other companies' games starring Disney characters were changed to non-Disney licences when released outside of Japan, specifically in the United States. This is because Capcom had exclusive rights to the Disney property in the US at the time.