请指点句子理解

lf

偶碰到长句子脑袋就要、、、



According to one theory, leavening bread so that it will rise was
discovered when some yeast spores drifted onto a dough that had been
set aside for a while before baking.



请问如何在短时间内去理解它？遇到这类句子应该使用什么样的思维？





还有这句：



Conditions there were favorable。



请问这是什么怪结构？





谢谢！！！！！！！！！！！！！！！！！！