上面的句子有些问题，搜到一个意思相近，表达比较靠谱的版本如下：
These enhancements, along with hundreds of other changes per month that increase user satisfaction, are the major reason that Bing is profitable and that its share of U.S. searches conducted on personal computers has risen to 23%, up from 8% in 2009, the year it was launched.
两个that从句是并列的定语从句。
参考译文：
这些改进，加上每个月数以百项旨在提升用户满意度的其他变化，是Bing能够盈利的主要原因，也使其在美国个人电脑搜索市场的份额从2009年推出时的8%增长到了23%。
