When I watched asaw the news abouthat Prince Harry and Princess Meghan would abandon their Royal titles, I thought that they made a wonderful choice, though people have made fun of them or criticized Princess Meghan.

I think people should helpsupport them liveing without using taxes.

Your sentence is also correctly, but I suspect supporting them rather than helping them is what you actually mean.

A long ago, he liked curry and rice so much that he escaped from athe junior high school he went to.

Alternatively: A long time ago, he skipped school to eat curry and rice because he enjoyed it so much.
This worked a bit better with 'A long time ago' at the front, because it leads with what he actively did a long time ago.

I heard he really wanted to be a commoner so much, as he has loved the commoner's life<style?>.

He iwas the first emperor who chose his wife from among the commoners.

The other correction is a bit more direct and so probably better than this though.

He was distressed by thinking about how he had to live by taxes from them.

On the other hand, though some politicians and some people working for the national government are often corrupt, still they get a salary and severance package or retirement allowance at athe full amount without hesitation.

'some people working for the national government' == 'public servant', usually.

I strongly hope they should learn from Prince Harry.

I wish the couple ofhope the Duke and Duchess of Sussex wouldill answer happily to an interview someday that it was good to leave the Royal family.

A lot of tax money can be saved that muchwithout this.

I don't completely understand what you are trying to say, but I think that you are saying that tax money can be saved if the royal family wasn't funded by taxes. I corrected it to show this better.

I think people should help them live without usingthat they should live without spending the U.K's taxes.

You could write this in a variety of ways. You could say "I think that they should live without the the help of taxpayer funds" or something like that. What you wrote still makes sense but saying "using taxes" sounds a little weird. I made it a little more concise.

When I watched asaw the news about Prince Harry and Princess Meghan would abandoning their Royal titles, I thought they had made a wonderful choice, though people have made fun of them or criticized Princess Meghan.

Although Harry is a prince, Meghan isn't a princess. I'm not too familiar with the ins and outs of royal titles, maybe an enthusiastic royalist will come along and correct us both.

Their living cost iss are coveringed by taxes.

can be saved that much.

I don't quite understand what you're trying to say here.

I think people should help them live without using taxes.

Again, not too sure what you mean.

A long time ago, he likenjoyed curry and rice so much that he escaped from a junior high school he went toskipped school to eat it.

"to skip school" - to take a day off/not go to school when one should

I heard he really wanted to be a commoner so much as hbecause hase loved the idea of a commoner's life.

He never experienced life as a commoner, so he loved "the idea". Not trying to insult him, just trying to demonstrate. I would love to live in Spain, but I have never even been to Spain, therefore I love the idea of a life in Spain. (illustration)

He iwas the first emperor who chose his wife among commonersa commoner as his wife.

Whenever the Japanese people suffered frombecause of disasters, he visited the placeaffected areas and the sufferervictims.

He was distressed by thinking about he had to live by taxes from themthat he lived off their taxes.

Originally, their privacy haven't had beenwasn't protected.

OIn the other hand, somecontrast, politicians and some people working for the national government are often corrupt, still they get. Despite this, they still get their salary and severance package or retirement allowance at ain full amount without hesitation.

I strongreally hope they should learnfollow Prince Harry's example.

I wish the couple ofhope the Duke and Duchess of Sussex would answer happilyill someday agree to an interview somedand say that it was a good decision to leave the Royal Family.

"Wish" doesn't sound right to me here, maybe because it's a longer sentence.