请教个简单的句子语法结构

gamxiaoyuan

If the 18-year-old’s way of maturing is to slob out on Hampstead Heath soaking up sunshine or spending a year working with fishermen in Cornwall, then that’s what will be productive for that person.
我觉得这句话这样写的话spending不就和soaking对应了么？我认为作者本意是把spending和slob out对应，所以spending应该改成to spend吧？而且我觉得soaking up作为伴随状况，前面也应该加个逗号吧...