الدرس اللي على الكمبيوتر سهل اكتر من الدرس اللي على التليفون.

اللي is the Egyptian Arabic relative word meaning that / which / the one that.

So:

• الدرس اللي على الكمبيوتر = the lesson that is on the computer
• الدرس اللي على التليفون = the lesson that is on the phone

A key point: in Egyptian Arabic, اللي does not change for gender or number. It stays اللي in all cases.

In Arabic, the present-tense verb to be is usually omitted.

So:

• الدرس ... سهل literally looks like the lesson ... easy
• but it means the lesson ... is easy

This is completely normal in both Egyptian Arabic and Standard Arabic.
If you wanted past or future, then Arabic would usually use a verb:

• كان سهل = was easy
• هيكون سهل = will be easy

The sentence uses the very common Egyptian pattern:

adjective + أكتر من

So:

• سهل اكتر من = easier than
  literally: easy more than

This is a very natural colloquial way to make comparisons.

So the core structure is:

• سهل اكتر من ... = easier than ...
• صعب اكتر من ... = more difficult than ...
• سريع اكتر من ... = faster than ...

You may also hear the single-word comparative أسهل من for easier than, but سهل أكتر من is very common in Egyptian speech.

Because Egyptian Arabic often prefers an analytic comparative, especially in everyday speech:

• سهل أكتر من = more easy than / easier than

Instead of always using the built-in comparative form:

• أسهل من = easier than

Both can be understood, but سهل أكتر من sounds very natural in colloquial Egyptian.

Also, سهل agrees with الدرس, which is masculine singular.

على literally means on, and in this sentence it means something like:

• on the computer
• on the phone

This is used for content that appears on, is accessed through, or is available on a device.

So:

• اللي على الكمبيوتر = the one on the computer
• اللي على التليفون = the one on the phone

It does not necessarily mean physically sitting on top of the computer or phone. It often means displayed on, available on, or being used through that device.

Yes, Arabic often repeats the noun, and that is exactly what happens here:

• الدرس اللي على الكمبيوتر ... من الدرس اللي على التليفون

This is very normal and clear.

In some contexts, speakers may shorten the second part and leave out the repeated noun if it is obvious, but repeating الدرس is completely natural and often clearer for learners.

So the repeated noun is not strange or redundant in Arabic.

Arabic uses definiteness a bit differently from English.

Here, الكمبيوتر and التليفون are definite:

• the computer
• the phone

But in context, this can still sound natural even if English might use a or no article depending on situation.

Also, borrowed nouns in Arabic can take the definite article just like native Arabic nouns:

• كمبيوتر → الكمبيوتر
• تليفون → التليفون

So there is nothing unusual about adding الـ to these words.

In Egyptian Arabic, اللي is commonly pronounced something like illi or elli, depending on the speaker.

A simple learner-friendly pronunciation is:

• اللي = illi

So the beginning of the sentence can sound like:

• ed-dars illi ʿala l-kombyūter...

You do not need to force a Standard Arabic pronunciation here; اللي is a very common colloquial Egyptian form.

A helpful approximate transliteration is:

ed-dars illi ʿala l-kombyūter sahl aktar min ed-dars illi ʿala t-tilifōn

A few pronunciation notes:

• الدرس → ed-dars
  because د is a “sun letter,” so the l of ال assimilates
• الكمبيوتر → il-kombyūter or el-kombyūter
• التليفون → it-tilifōn or et-tilifōn
  because ت is also a sun letter, so the l assimilates here too
• اكتر is usually pronounced aktar
• من is often pronounced min in Egyptian

You do not need perfect phonetics at first; getting the rhythm right matters more.

Because it describes الدرس, and درس is a masculine singular noun.

So:

• درس = masculine singular
• سهل = masculine singular adjective/predicate

If the noun were feminine singular, the adjective would usually be feminine too. For example:

• المادة سهلة = the subject is easy

So in your sentence, سهل matches الدرس.

It is clearly colloquial Egyptian-style Arabic, mainly because of forms like:

• اللي instead of Standard Arabic الذي / التي / الذين
• اكتر من as a colloquial comparison pattern
• everyday vocabulary like التليفون

A more Standard Arabic version might look different, for example using:

• الدرس الذي على الكمبيوتر أسهل من الدرس الذي على الهاتف

So your sentence is very natural for Egyptian Arabic learners.

Yes. A very literal breakdown is:

• الدرس = the lesson
• اللي = that / which
• على الكمبيوتر = on the computer
• سهل = easy
• اكتر من = more than
• الدرس اللي على التليفون = the lesson that is on the phone

So a literal translation would be:

The lesson that is on the computer is easy more than the lesson that is on the phone.

That literal version is not natural English, but it helps show the Arabic structure. The natural English meaning is:

The lesson on the computer is easier than the lesson on the phone.