Complex sentence: The participation of soldiers from the Belgian Congo was, however, largely forgotten following Congolese independence in 1960 and decades of subsequent war, though in recent years the profile of the veterans has been raised by exhibitions creating greater public awareness.
Split into simpler sentences: The participation of soldiers from the Belgian Congo was, however, largely forgotten following Congolese independence in 1960 and decades of subsequent war. In recent years the profile of the veterans has been raised by exhibitions creating greater public awareness.