一緒に => together N5
一度に => all at once N3
受身形 => Passive voice N4
~V使役受身      => causative-passive form N4
Conjugate verbs
ひとつには…ためである => Partly because of ... N3
Cause, reason
一口に…といっても => Although in general... N2
Evaluate
~ためしに…てみる => to attempt, to test, to try out N1
Invite and advise
始める => to start; to begin to ~ N4
~んがため(に)/~んがための      => in order to ~ N1
ため(に) => For, because… N4
Cause and Effect
~はめになる(~羽目になる)     => to get stuck with (some job); to end up with (something unpleasant) N1
あらためる => to revise; to replace N3
Happens next