我注意，如果我说明某事

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I notice that if     ( the time  )     we explain to others about something, we can learn a lot of new knowledge. So that's why I think teach others besides learn by yourself is important/necessary ! 

我注意到，如果我们在给别人解释说明一些事情的时候，反倒可以从中学（习）到很多新知识。所以我认为，除了自学(=自己学习)以外，教（jiao；not“叫” ）会其他人也是很有必要的。

→→→  我注意到，如果我们在给别人解释说明一些事情的时候，反倒可以从中学到很多新知识。所以我认为，除了自学以外，教会其他人也是很有必要的。

PS:

besides 除了.....以外，还.....

except   除了.....（= 不包括..... ）

Advice:

You should not rely too much on translator and try to upload the English version of your Chinese article with the original text together.

Gib Gas, Robin~ 

我注意發現，如果我说明教別人某事

我注意，如果我说明某事

I notice that if we can explain to others about something, we can learn a lot of new knowledge. That's why I think learning by yourself is very important. Not sure if that's what you meant.