Consider the following sentences:
See the experiments reported in the chapters related to machine learning.
See the experiments that are reported in the chapters related to machine learning.
See the experiments reported in the chapters that are related to machine learning.
See the experiments that are reported in the chapters that are related to machine learning.
When I’m short of space, I construct sentences such as sentence 1. When there is plenty of space, I might decide to write as shown in sentence 4. Often I find myself choosing between such sentences as sentence 2 and 3, and I’d be grateful if somebody could clarify the difference.