下面的句子来自 2012安徽卷阅读理解 A，为什么句首的 started 没有逻辑主语？

Started in the 1950s there is a wide variety of shoes and boots belonging to everyone from queens and presidents to pop stars and actors!

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Room 1

The celebrity (名人) footwear section is probably the most popular in the entire museum. Started in the 1950s there is a wide variety of shoes and boots belonging to everyone from queens and presidents to pop stars and actors! Most visitors find the celebrities’ choice of footwear extremely interesting.