Complex sentence: She was first inspired to take action after she returned to her father's land, and found that the creeks had dried up, and what were legally, First Nation's traditional hunting grounds, had been blocked off and were being logged.
Split into simpler sentences: She was first inspired into action after she returned to her father's land. She found the creeks had dried up, and what was legally First Nation's traditional hunting grounds, had been blocked off and were being logged.