问题: 这个英文句子有错。请问错在哪？怎么改？
In 1850 Jim, a Black American explorer,discovered in the mountains of the Sierra Nevada a pass soon becoming an important gateway to California gold-rush country.
解答:
In 1850 Jim, a Black American explorer,discovered in the mountains of the Sierra Nevada a pass /,which soon became/ an important gateway to California gold-rush country.
In 1850 Jim, a Black American explorer,discovered in the mountains of the Sierra Nevada a pass /soon to become/ an important gateway to California gold-rush country.
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