They were spurred by the inflation of the 1970's，which，combined with California's rapid population growth，pushed housing prices，as well as rents, to record levels.
(which引导非限定性定语从句)
它们受到了20世纪70年代通货膨胀的刺激，这次通货膨胀与加利福尼亚人口的迅速增长结合在一起，将房价与租金推到了创纪录的水平。
分句1：They were spurred by the inflation of the 1970's
分句2：which，combined with California's rapid population growth
分句3：pushed housing prices，as well as rents, to record levels
分句1是整个长句子的主句
分句2是分句1的定语从句，修饰inflation
分句3同样是分句1的定语从句，主语仍然是上一句中的which
1和2、3嵌套
2和3并列
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