you are as good as I thought ..
let us discuss what you have observed ..
anyway, I hope you see again the texts
you have to know the differences between a simple sentence and a complex one ..
this is a complex sentence " After a long time, he found a clue which made the mysterious door possible to be solved
because of containing after and comma ..
a simple sentence like " he likes to eat alone "
please refer to this website to take a look ..
http://eslbee.com/sentences.htm
for the word " answer " it is a very common word so , i replaced by response ..
what you have advised me , i will take it as a good advice
i really appreciate your comments and like them as well ..
please be always here
waiting for the rest of your notes