が必要 => need; necessary N4
必要がある => Need/Need to N4
最中に => while; during; in the middle of ~ N3
〜がさいご(が最後) => if you do... negative result N1
Decisive (resolute decision)
[最中「さいちゅう」] => In the middle of A N3
Time, Situation
たが[最後「さいご」] => Once A occurs, B happens N1
Information, Report
[要「よう」]するに => A. In short/put simply, B N2
Adjectival, Descriptions
要するに => in short; in a word; to sum up; to put it simply ~ N2
[必要「ひつよう」]はない => It is not necessary for A to be done N2
Needs, Requirements
~もなにも(~も何も)      => ~ and everything N1
Description
もしも => uncertainly... N2
Speculation
もしも~なら/ もしも~たら/ もしも~ても => if; in the case; supposing ~/If... no matter what N3