Complex sentence: Following the assassination of the king in 1610 the larger project of the two galleries was halted, however the "Pavilion des Tuileries" which actively formed the junction between the two structures remained.
Split into simpler sentences: Following the assassination of the king in 1610 the larger project of two galleries was halted. However the "Pavillon des Tuileries", which actively formed the junction between the two structures remained.