as是否随引导随着状语

Mr. Dursley hummed as he picked out his most boring tie for work, andMrs. Dursley gossiped away happily as she wrestled a screaming Dudley into his high chair

前半句，as是否随引导随着状语，完整形式应该是Mr. Dursley hummed， when he pickedout his most boring tie for work。这是一句话，那样后半句是否又是前半句的一个随着状语？

Mr. Dursley hummed as he picked out his most boring tie for work, and Mrs. Dursley gossiped away happily as she wrestled a screaming Dudley into his high chair.

as 是连词，引导的从句没随着状语从句的说法。这是时间状语从句，跟主句同时发生，翻译为“ 一边...（从句），一边....（主句）”。

后半句前面有一个并列连词 and，说明它是第二个并列分句。哪儿来的随着状语？建议网友认真读一下句子的结构和分类。