Complex sentence: The Royal Navy usually maintains a presence with the deployment of a warship to the NATO multi-national squadron Standing Naval Force Mediterranean (STANAVFORMED) and to the NATO Mine Countermeasures Force (South).
Split into simpler sentences: The Royal Navy maintains a presence with the deployment of a warship to the NATO multi-national squadron Standing Naval Force Mediterranean (STANAVFORMED). The Navy also usually provides a warship to the NATO Mine Countermeasures Force (South).