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
~をかわきりに(~を皮切りに)      => One after another; starting with ~ N1
切る => Give up, stop... N3
Happens next
切る/切れる/切れない => to do something completely to the end/unable to do; too much to finish/complete N3
…とばかりおもっていた => Thought that ... N3
Speculation
にあたり/にあたって => at the time; on the occasion of ~ N2
たり~たり => do such things as A and B N5
~ばよかった/~たらよかった/~ばよかったのに/~たらよかったのに => If only N3
[切「き」]れない => Can't finish/complete A N3
Potential, Possibility
~たり~たりする => Do things like V1,V2 N5
Verb suffixes
にわたって/にわたり => Over the course of A (continuous action), Throughout A N2
Time, Situation