Complex sentence: Black Stars'(Ghana national football team's) main footballing rivalry is with Super Eagles (Nigeria national football team); the "Battle of Supremacy on the Gulf of Guinea" is between two of the most successful teams on the African continent.
Split into simpler sentences: Black Stars'(Ghana national football team's) main footballing rivalry is with Super Eagles (Nigeria national football team). The "Battle of Supremacy on the Gulf of Guinea" is between two of the most successful teams on the African continent.