もし不満があったら知らせてください、調べます。

If you have any complaints, let me know, and I'll look into them.

もし不満(ふまん)があったら知(し)らせてください、調(しら)べます。

Moshi fuman ga attara shirasete kudasai, shirabemasu.

若し (もし)

if; in case; supposing

不満 (ふまん)

dissatisfaction; displeasure; discontent; complaints; unhappiness; disgruntled

が (が)

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

有る (ある)

to be (usu. of inanimate objects); to exist; to live; to have; to be located; to be equipped with; to happen; to come about

知らせる (しらせる)

to notify; to advise; to inform

下さる (くださる)

to give; to confer; to bestow; to kindly do for one; to oblige; to favour; to favor

調べる (しらべる)

to examine; to investigate; to check up; to sense; to study; to inquire; to search

Readings: フ、ブ

Meanings: negative, non-, bad, ugly, clumsy

Readings: マン、バン、み.ちる、み.つ、み.たす

Meanings: full, fullness, enough, satisfy

Readings: チ、し.る、し.らせる

Meanings: know, wisdom

Readings: チョウ、しら.べる、しら.べ、ととの.う、ととの.える

Meanings: tune, tone, meter, key (music), writing style, prepare, exorcise, investigate, harmonize, mediate