Complex sentence: They have found Grizzles are moving into Black bear and Kermode bear salmon feeding grounds more often, this disrupts the feeding of Kermode and Black bears as they often retreat once Grizzles arrive.
Split into simpler sentences: They have found Grizzles are moving into Black bear and Kermode bear salmon feeding grounds more often. This disrupts the feeding of Kermode and Black bears as they often retreat once Grizzles arrive.