asagohan no nokorimono to tamagoyaki dake de mo, hirugohan ni ha zyuubun desu.

A natural reading is:

• 朝ご飯 → あさごはん
• 残り物 → のこりもの
• 卵焼き → たまごやき
• 昼ご飯 → ひるごはん
• 十分 → じゅうぶん

So the whole sentence is read:

あさごはん の のこりもの と たまごやき だけ で も、ひるごはん に は じゅうぶん です。

残り物 means leftovers or food that was left over.

So:

• 朝ご飯 = breakfast
• 朝ご飯の残り物 = the leftovers from breakfast

The particle の connects the two nouns. In English, it often corresponds to of or from, but more generally it just shows that one noun modifies another.

So this is not just any leftovers; it is specifically breakfast leftovers.

と connects nouns and usually means and.

So:

• 残り物と卵焼き = leftovers and omelet / leftovers and tamagoyaki

Here it is simply listing the food items that make up the meal.

In this sentence, the natural reading is that だけ applies to the whole set:

• 朝ご飯の残り物と卵焼きだけ = just the breakfast leftovers and omelet

In other words, the speaker means that those two things alone are enough.

Japanese often places だけ after the last item in a list, and it can limit the whole list. So this does not usually mean something like the leftovers and only the omelet in a narrow contrastive sense. It means only those items.

だけ means only or just.

Adding も gives extra emphasis, so だけでも often means something like:

• even just ...
• ... alone is enough
• at least with just ...

So here the nuance is:

• Even just breakfast leftovers and omelet are enough

The も makes it sound a little softer or more emphatic, as if the speaker is saying that this small amount is still sufficient.

This で is part of the pattern used with 十分.

A very useful pattern is:

• Xだけで十分です = X alone is enough

In this pattern, で marks the thing being used or the amount/content that is sufficient.

So:

• 朝ご飯の残り物と卵焼きだけで十分です = Just breakfast leftovers and omelet are enough

Then adding も gives:

• 朝ご飯の残り物と卵焼きだけでも十分です = Even just breakfast leftovers and omelet are enough

So the で is not random; it belongs to the structure that means to be enough with X.

This is に + は.

• に marks the target or purpose: for lunch
• は adds topic or contrast: as for lunch

So 昼ご飯には十分です means something like:

• It is enough for lunch
• As for lunch, it is enough

The は often gives a slight contrastive nuance, such as:

• enough for lunch, though maybe not for something bigger
• enough at least in the case of lunch

That contrast does not have to be strong, but it is often there in the background.

Here, 十分 means enough or sufficient.

It behaves like a na-adjective or adjectival noun:

• 十分です = is enough / is sufficient
• 十分だ = plain form
• 十分な量 = a sufficient amount
• 十分に食べた = ate sufficiently / ate enough

In this sentence, 十分です is the predicate of the sentence.

Japanese often leaves out subjects when they are understood from context.

Here, the thing that is enough is the food just mentioned:

• 朝ご飯の残り物と卵焼きだけでも

So in more explicit English, the sentence is saying:

• Breakfast leftovers and omelet alone are enough for lunch

A fuller Japanese sentence could theoretically include something like それは, but in natural Japanese it is usually omitted.

The comma is mainly for readability and pacing.

It helps separate:

• the food being discussed: 朝ご飯の残り物と卵焼きだけでも
• the judgment about it: 昼ご飯には十分です

Japanese commas are often more flexible than English commas. This comma is natural, but the sentence could also be written without it and still be grammatically correct.

Yes, it is polite because it ends with です.

• 十分です = polite
• 十分だ = plain

So this is a normal polite statement, suitable for everyday conversation when speaking politely. The rest of the sentence is also neutral and natural.