一度に => all at once N3
一体 => …the heck; …in the world; …on earth N3
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
といったところだ => Display an amount/level/degree A (程度) N1
Degree/ Level/Amount