1. This isn't a rental car - it's privately owned.

küskinei mäntätöt kömmi, kosti inteimät a

küski-nei mäntä-töt kömmi, kosti intei-mät a

transport-CONJ nearby-time REF.NEG, ASEX DEM-nearby EMO.CNTR

"(This) transport and temporal nearbyness do not relate, someone nearbying this (transport) in fact"

2. Life is meaningless if it begins well but ends badly.

öötista tilämännisin, tottoó män'iütte, ii pökikömmi näiöhta

ööti-sta tilä-männi-sin, totto-ó män-iütte, ii pöki-kömmi näi-öhta

moving-ABST beginning-AMA-TOP, time-CONJ.PSTR liking-OPP, DM heading-PRV sadness-PL

"Speaking of movingness starting good, (if) time passes and (it's) anti-good, so (it‘s) without goal, very sad"

I use gloss abreviations from conworkshop conworkshop.com/grammar_forms.php