How can I correct my sentences

Laura's garden has been flourishing since she added a lot of compost to the soil.
This is correct.

Its Very Important to understand the message ,, how else can you reword it if you dont know the meaning

In today's world most of the work is done online and through internet lots of work related things like documentation, typing etc are doing through computers via internet. Firstly the online sentence grammer check is most reliable and most effective way in judging sentence rather than manually done. Secondly it is error free in using it, it automates the sentence in grammer way and makes the sentence look in proper way, it proofreads your mistakes in grammer and corrects it. Third i would say the time spend on this online sentence grammer check is very less compared with manually task done.
http://www.sentencestructure.org/

The Sentence Correction helps you write better English and efficiently corrects texts. Based on the context of complete sentences, Ginger Grammar Checker uses patent-pending technology to correct grammar mistakes, spelling mistakes and misused words, with unmatched accuracy. Ginger's grammar check software improves your text just like a human reviewer would. Enjoy the most expansive online Sentence Correction on the market. Benefit from single click proofreading wherever you type so that you improve your English writing while you learn from your Sentence mistakes.
Sentence Correction

Online sentence correction is a tool to find spelling of grammer and sentences. This is our older tool which is helpful for us. this tools may used to find grammer errors in english texts. We don't worry for writing skill any more. This tool also help us for correction any of the english texts.
http://www.sentencecorrection.biz/

I'M ASSUMING YOU WANT AN ACTUAL SENTENCE USING BOTH OF THESE WORDS. IF I AM INCORRECT ABOUT THAT PLEASE LET ME KNOW. IN THE MEANTIME HERE IS A SENTENCE USING BOTH WORDS CORRECTLY. IF I HELP PLEASE NOTE THAT TOO. THANKS!
"My initial perception of the man was quite negative because of the numerous heinous crimes he had been charged with."

If you're using a laptop, it sounds like the trackpad is too sensitive, so that as you type, when your thumbs touch the pad, the cursor moves.  You can adjust this easily in settings/preferences.