あなたが手伝ってくれれば、大いに手間が省ける。

Your help will save us a lot of work.

あなたが手伝(てつだ)ってくれれば、大(おお)いに手間(てま)が省(はぶ)ける。

Anata ga tetsudattekurereba, ōini tema ga habukeru.

貴方 (あなた)

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

手伝う (てつだう)

to help; to assist; to aid; to contribute to; to be a factor in

大いに (おおいに)

very; much; greatly; a lot of

手間 (てま)

time; labour; labor

Readings: シュ、ズ、て、て-、 -て、た-

Meaning: hand

Readings: デン、テン、つた.わる、つた.える、つた.う、つだ.う、 -づた.い、つて

Meanings: transmit, go along, walk along, follow, report, communicate, legend, tradition

Readings: ダイ、タイ、おお-、おお.きい、 -おお.いに

Meanings: large, big

Readings: カン、ケン、あいだ、ま、あい

Meanings: interval, space

Readings: セイ、ショウ、かえり.みる、はぶ.く

Meanings: focus, government ministry, conserve