Complex sentence: The Adare basin is an extensional rift basin, located along a seafloor spreading center and contains the Adare Trough, the failed arm of the tertiary spreading ridge separating East and West Antarctica, similar in structure to The East Africa Rift System.
Split into simpler sentences: The Adare basin is an extensional rift basin located along a seafloor spreading center. Centrally located in the Adare Basin is the Adare Trough, the failed arm of the tertiary spreading ridge separating East and West Antarctica, similar in structure to The East Africa Rift System.