なくて済む/ないで済む => get by without doing ~ N2
ずに済む => get by without doing ~ N2
を[経「へ」]て => After A N1
Time, Situation
…のも無理 (は) ない => It's natural for... N3
Evaluate
~をたて(~を経て)      => through; after; via N1
て済む => sufficient by; no problem to; resolve by ~ N3
のも無理もない => (to be) natural,(to be) understandable N3
Evaluate