It is read:
きょう の あさごはん は トースト と オレンジ です。
A few notes:
In normal Japanese writing, it would usually appear without spaces: 今日の朝ご飯はトーストとオレンジです。
は marks the topic of the sentence.
The topic is the whole phrase:
今日の朝ご飯は = As for today’s breakfast, ...
Then the rest of the sentence says what it is:
トーストとオレンジです = it is toast and orange(s)
So the structure is basically:
[topic] は [comment] です
This is a very common question.
In words like:
ご飯 does not always mean literal cooked rice. It can also mean a meal.
So 朝ご飯 means breakfast even if the meal is toast, eggs, cereal, or anything else.
Katakana is often used for:
Here:
So katakana is the normal writing choice.
In this sentence, 今日 is read きょう.
That is the normal reading when it means today in everyday speech.
The reading こんにち exists, but it is used in more limited contexts, such as certain formal or set expressions. In this sentence, こんにち would not be correct.
です is the polite copula. It works like is / am / are in this kind of sentence.
So トーストとオレンジです means it is toast and orange(s).
In casual speech, です may be omitted:
That sounds more casual and conversational.
Yes, it is natural.
It is a simple and clear sentence for saying what today’s breakfast is.
Some natural variations are:
今日の朝ご飯はトーストとオレンジです。
Neutral and polite.
今日の朝食はトーストとオレンジです。
More formal because 朝食 is more formal than 朝ご飯.
今朝はトーストとオレンジでした。
More like This morning, I had toast and orange(s), depending on context.
So the original sentence is perfectly fine, but Japanese offers slightly different ways to express the same idea.
No. Standard Japanese normally does not use spaces between words.
So this sentence would usually be written as:
今日の朝ご飯はトーストとオレンジです。
Spaces are often added in beginner materials to make the structure easier to see.