Could you tell me the meaning of the sentence? There are people dying if you care enough for the living.

As a sentence, it’s nonsensical. Is this part of a song?

Yes of course. Heal the world-Michael Jackson. It seems that you rarely listens to songs. Anyway, I still can’t understand anything when looking over the whole lyrics.

I often listen to songs - not the same songs as you, perhaps, and definitely not much in the way of Michael Jackson’s songs.

Those lyrics need to be punctuated like this:
“There are people dying. If you care enough for the living, make a better place for you and for me.”

At the moment people are dying. If you care for those who have not yet died, do something to make the world a better place for all of us (and stop more people dying).

Oh yes. Thank you very much.

Tom learned English very hard. Can we change this sentence into Passive Voice?

English was learned very hard by Tom.(?)

Could any one of you explain it to me?

Of course you can. Any sentence containing a transitive verb can be changed into passive voice.

and remember to post a question in a different topic

Tom learned English very hard’ is not a good way of expressing this idea.
You cannot ‘learn something hard’ You can ‘work hard at something.’
Tom worked very hard at English.
(English was worked at very hard by Tom.)
Tom worked very hard to learn English.
(Learning English was worked at very hard by Tom.)

Notice that although it is grammatically possible to turn these sentences into the passive voice, many sentences do not sound very fluid and natural when turned into the passive, even when they are correct.

Thank you very much.
Thanks to your advice, my english improves rapidly!