Complex sentence: Zhengyangmen gatehouse survived the demolition of city walls in the late 1960s during the construction of the Beijing Subway, while other gates such as Deshengmen in the north and Dongbianmen in the southeast only have their archery towers standing.
Split into simpler sentences: Zhengyangmen gatehouse survived the demolition of city walls in the late 1960s during the construction of the Beijing Subway. While others such as the Deshengmen in the north and Dongbianmen in the southeast only have their archery towers standing.