Today I went to the library in order to complete today's learning processstudying.

It is difficult for me to concentrate on books when staying at home.

Because of the many temptations at home, I can't help but get distracted.

After everything was doneI finished, I went to my grandparents' home to eat dinner.

Your sentence is correct. This is another way to say it.

My grandpa is suffering from the health problems.

It is painful for him to sit or walk, so he spends almost entirof the day lying in bed.

Last time I went there but didn't see him, because my grandpa had a painkiller and then caughtI didn't see him the last time I visited, because he took a painkiller to catch up on some sleep.

Today I saw him sitting by the bed, feellooking so uncomfortable.

I feelam heartbroken that he was just diagnosed with cancer about two years ago.

I know the only thing I can do now is to spend more time keeping him company and talking to him.

It i's difficult for me to concentrate on books when staying at home.

"it is" is grammatically correct, but it sounds very robotic. using the contraction "it's" is a lot more natural

My grandpa is suffering from the health problems.

Today I went to the library in order to complete today's learning process.

Today I went to the library in order to reach today's learning goal.

It is difficult for me to concentrate on books when staying at home.

Because of the many temptations at home, I can't help but get distracted.

After everything was done, I went to my grandparents' homuse to eat dinner.

My grandpa is suffering from the health problems.

It is painful for him to sit or walk, so he spends almost the entire day lying in bed.

Last time I went there but I didn't see him, because my grandpa hadhe had taken a painkiller and then caught up on some sleep.

I feelt heartbroken that he was just diagnosed with cancer about two years ago.