私は1年以上前から日本語を勉強してきました。
It's a very natural phrase.
(I have studied Japanese)
私は1年以上前から日本語を勉強しました。
少し不自然な気がします。I think it's a little strange one.
(I studied Japanese )
November 10, 2018
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For what I know is [Vてくる] is refered to when something started and continuos.
November 10, 2018
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"しました" means an action I did at prcise moment.
"してきました" means continuous flow of the action.
November 10, 2018
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