"实行中央集权" can be translated into English as "implement centralization of power" or "practice centralization".
Here are some example sentences for context:
1、 The country decided to implement centralization of power to strengthen national governance.
(该国决定实行中央集权,以加强国家治理。)
2、 Historically, some regimes have practiced centralization to maintain stability and control.
(历史上,一些政权为了维持稳定和控制而实行中央集权。)