Complex sentence: He came to national prominence in 1970 for his role in the historic but unsuccessful Yirrkala land rights case before Justice Blackburn-the first legal challenge by Aboriginal people to mining companies' rights to exploit traditional lands.
Split into simpler sentences: He came to national prominence in 1970 for his role in the historic but unsuccessful Yirrkala land rights case before Justice Blackburn. This case was the first legal challenge by Aboriginal people to mining companies' rights to exploit traditional lands.