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
... としての... => ...as a... N3
Position, perspective
~せめてもの => at least, at most N1
Compare
~てからというもの      => ever since ~ N1
…ばあいをのぞいて => Except for N2
Exception
のに対して => towards; against; regarding; in contrast with ~ N2
ときているから/ときているので => because of ~ N1
この / その / あの => this / that N5
Spatial relations
ものの => but, although N2
ものの => but, although N2
Things do not match the prediction
その...その => Every... N1
Happens next