Complex sentence: Due to an accident on 24 July 1908 in which rock, washed with alpine waters, collapsed into the tunnel gallery killing 25 Italian miners, construction work was halted for six months before the gallery was sealed and plans made to bypass the site.
Split into simpler sentences: Due to an accident on 24 July 1908 in which rock, washed with alpine waters, collapsed into the tunnel gallery killing 25 Italian miners. Construction work was halted for six months before the gallery was sealed and plans made to bypass the site.