てさしあげる => Do for N4
Give and take advice
さえ~ば => If only A/B, then C, If only A occurs, then B N2
Conditional, While
て[下「くだ」]さる => Do for someone N4
Give and take advice
なければならない => Must do A; have to A N4
Can, Should, Must
かける => Is doing, haven't finished yet N2
Will, Decision, “Doing”
[続「つづ」]ける => continues, to continue to N4
Secondary Verb
とされる => It is said/believed/thought that A N1
Information, Report
さえ/にさえ/でさえ => Even N3
Not only, Not even
を[余儀「よぎ」]なくされる => Must do A N1
Will, Decision, Doing
~ば => If~ N4
Conditional
ともなると,ともなれば => When (the time/situation) A N1
Time, Situation
に[先駆「さきが」]けて => The earliest, very first in A; Ahead of A, in advance of A N1
Time, Situation