גם לה היה משעמם, ולכן ישבנו יחד וקראנו בספרייה שעה אחת.

Literally, גם לה means also to her or to her too.

In Hebrew, feelings and experiences are often expressed with a structure like:

ל־ + person + היה/הייתה + adjective

So גם לה היה משעמם is literally it was boring to her too, which in natural English becomes she was bored too.

This is very common in Hebrew, even though English normally uses a different structure.

Because the sentence is not built like she was X. It is built more like it was X to her.

So:

• לה היה משעמם = it was boring to her
• natural English: she was bored

If you used היא, you would need a different structure, for example:

• היא הייתה משועממת = she was bored
• גם היא השתעממה = she also got bored / became bored

So לה is correct because this sentence uses the to someone pattern.

This is one of the most common things learners notice.

In לה היה משעמם, the word משעמם does not agree with the woman. The expression is impersonal: literally, it was boring to her.

That is why Hebrew uses:

• היה משעמם לי
• היה משעמם לה
• היה משעמם להם

The form משעמם stays masculine singular in this kind of expression.

If you wanted a sentence where the woman herself is the grammatical subject, you would say something like:

• היא הייתה משועממת = she was bored

So:

• לה היה משעמם = impersonal, very common
• היא הייתה משועממת = personal description of her state

These are related, but they are not the same.

• משעמם = boring

  • היה לה משעמם = it was boring to her / she was bored

• משועממת = bored (feminine adjective/participle)

  • היא הייתה משועממת = she was bored

• השתעממה = she became bored / she got bored

  • from the verb להשתעמם

So the sentence uses משעמם because it is expressing the experience as it was boring to her.

ולכן means and therefore, and so, or and for that reason.

It is made of:

• ו־ = and
• לכן = therefore / so

So:

גם לה היה משעמם, ולכן...
= She was bored too, and therefore...

In everyday speech, people might also use:

• אז = so
• אז לכן in some spoken styles, though that can sound redundant

But ולכן is perfectly normal and slightly more formal or written in tone.

Both are past-tense verbs in first person plural: we.

• ישבנו = we sat
• קראנו = we read

The ending ־נו often marks we in the past tense.

Examples:

• ישבתי = I sat
• ישבת = you sat
• ישבנו = we sat

and

• קראתי = I read
• קראת = you read
• קראנו = we read

So ישבנו יחד וקראנו means we sat together and read.

יחד means together.

Here:

ישבנו יחד = we sat together

Its position is very natural after the verb. Hebrew is often flexible with adverbs like this, so you may also hear slightly different word orders depending on emphasis.

For example:

• ישבנו יחד וקראנו...
• ישבנו וקראנו יחד...

These are similar, but the first one most clearly says that the sitting was together.

בספרייה means in the library.

It is made of:

• ב־ = in
• ספרייה = library

When ב־ is attached to a noun with the (ה־), Hebrew usually combines them:

• ב + הספרייה → בספרייה

So בספרייה means in the library, not in a library.

This happens with other prepositions too:

• בבית = in the house
• לילד = to the child
• מהספר = from the book

Both are possible.

• שעה = an hour
• שעה אחת = one hour

Adding אחת makes the number explicit. In English we often say for an hour, and Hebrew can express that simply with:

• קראנו שעה
• קראנו שעה אחת

Both can mean we read for an hour.

Also notice that שעה is a feminine noun, so one must be feminine too:

• masculine: אחד
• feminine: אחת

That is why it is שעה אחת, not שעה אחד.

Hebrew often expresses duration without a separate word equivalent to English for.

So:

• קראנו שעה אחת = we read for one hour
• literally: we read one hour

This is very normal in Hebrew.

If you want to make the duration more explicit, you can also say:

• קראנו במשך שעה אחת = we read for one hour
• קראנו שעה = we read for an hour

So the version in the sentence is natural.

In practice, most readers will understand that the whole activity happened in the library: we sat together and read in the library.

However, because בספרייה comes right after וקראנו, it is most directly attached to read.

So grammatically, the sentence most immediately says:

• we sat together
• and read in the library

But in normal context, it strongly suggests both actions happened there.

If someone wanted to make that absolutely clear, they might say:

• ישבנו יחד בספרייה וקראנו שעה אחת

Yes, it is natural and understandable Hebrew.

That said, native speakers might also say similar things in slightly different ways, for example:

• גם לה היה משעמם, אז ישבנו יחד וקראנו בספרייה שעה.
• גם היא השתעממה, ולכן ישבנו יחד וקראנו בספרייה במשך שעה.
• גם היא הייתה משועממת, אז ישבנו יחד לקרוא בספרייה.

The original sentence is perfectly fine. It just uses a very common Hebrew pattern: היה משעמם ל־... = it was boring to...