Dear Sir or Madam,
I am writing this letter with regard to your advertisement about the Spanish teacher who is required to teach you two children for a year. I am 40 years old Spanish working as a Spanish language teacher in a well-known private school in Madrid. Therefore, it will be my pleasure to apply for the occupation which you are looking for.
The foremost reason of applying for this job is that I have 10 years’ experience in Spanish teaching field. I have a vast history of educating young pupils from 8 to 15 years old. Moreover, I am bilingual, and I can speak English fluently as well which will be easy to communicate with you and your children.
I would like to inform you that in addition to Spanish, I am qualified to give private lessons of Math as well. As I studied Engineering for 5 years which is allowing me to teach Math for younger age.
I was looking forward to immigrate to Australia since 1 year. However, I am searching for a suitable job to allow me to settle in the country. So, hopefully my qualification and experience will meet your requirements.
Yours faithfully,
John. 
Dear Sir or Madam,
I am writing this letter with regard to your advertisement about the Spanish teacher who  
is required
 to teach you two children for a  
year
. I am 40 years  
old
 Spanish working as a Spanish language teacher in a well-known private school in Madrid.  
Therefore
, it will be my pleasure to apply for the occupation which you are looking for.
The foremost reason of applying for this job is that I have 10 years’ experience in Spanish teaching field. I have a vast history of educating young pupils from 8 to 15 years  
old
.  
Moreover
, I am bilingual, and I can speak English  
fluently
  as well
 which will be easy to communicate with you and your children.
I would like to inform you that  
in addition
 to Spanish, I  
am qualified
 to give private lessons of Math  
as well
. As I studied Engineering for 5 years which is allowing me to teach Math for younger age.
I was looking forward  
to immigrate
 to Australia since 1  
year
.  
However
, I am searching for a suitable job to  
allow
 me to settle in the country.  
So
,  
hopefully
 my qualification and experience will  
meet
 your requirements.
Yours  
faithfully
,
John.