帮忙分析下这个定语从句

问题描述:

帮忙分析下这个定语从句
However,after a year or so in which they became more serious about their work,“The Monkees” started to play their own instruments and write their own songs like a real band.
主要是in which

In which 意思是在a year 中,引到一个时间定语从句,一直到their work ,THE Monkeses 才是句子的真正的主语,started to play /write 才是谓语部分,其他的既是宾语