命令形 => Imperative form N4
を中心に => focused on; centered on~ N2
に先立って => before; prior to ~ N2
に[先立「さきだ」]って/に[先立「さきだ」]ち/に[先立「さきだ」]つ => Before A occurs/takes place N2
Time, Situation
[命令「めいれい」] => Do A (command) N4
Can, Should, Must
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous