have written/I saw/I wrote/I saw

[user_gary]

I wrote the above sentence on my own after I saw the following sentences
I have written the above sentence after I saw the following sentences.

Are the both sentences correct? If not, please tell me which one is correct.

Please help me.

[svartnik]

I wrote the above sentence on my own after I saw the following sentences
I have written the above sentence after I saw the following sentences.

Are the both sentences correct? If not, please tell me which one is correct.

Please help me.

The second needs repair.

I wrote ... after I saw/had seen....

[Harry Smith]

I wrote the above sentence on my own after I saw the following sentences
I have written the above sentence after I saw the following sentences.

Are the both sentences correct? If not, please tell me which one is correct.

Please help me.

Do you like this sentence? Is it similar to your first sentence?
I wrote the above mentioned sentence on my own after I looked through the following sentences.

[user_gary]

Do you like this sentence? Is it similar to your first sentence?

Yes
Thank you and Svartnik.

[Harry Smith]

Yes
Thank you and Svartnik.

You are most welcome!