Position of 在 电脑上 in "他常练习在电脑上用汉语写东西" My Chinese text has this sentence. 


  他常练习在电脑上用汉语写东西.


As I think, 在电脑上 indicates the "place" that all actions ("练习","用汉语写东西") take place. So what I do not understand is, why 在电脑上 (PLACE) is put after 练习 (VERB). It should have been put after 常.

Please explain to me. Thank you so much.
In "他常在电脑上练习用汉语写东西",  the location '电脑上' is placed before the verb '练习'
  
  他常 (he often)
  
  在电脑上(on computer) -- location
  
  练习 practice -- verb
  
  用汉语写东西 -- relative clause


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  In "他常练习在电脑上用汉语写东西" ,  the location '电脑上' is placed before the verb phrase '用汉语写东西'
  
  他常(he often)
  
  练习 (verb)
  
  在电脑上用汉语写东西 -- relative clause


~


  在电脑上 location 
  
  用汉语写东西 -- verb phrase (the verb is 写)


Both sentences mean "He often practices writing in Chinese on a computer". The difference is in the first sentence the location '在电脑上' is a relative phrase for the main verb '练习' (在电脑上练习) ; and in the second sentence, the location '在电脑上' is a relative phrase for the verb in the relative clause '用汉语写东西' (在电脑上用汉语写东西)