His research is deeply related to my project.

He was worst at word problems in elementary school math.

His explanation was impossible to understand.

He looked around in all directions, but there was no one in sight.

His success had a cause-and-effect relationship with his efforts.

He and I are related by blood.

There is a complex love triangle between them.

This is the book that I am reading.

His claim does not match the actual relationship.

The police only informed the authorized persons about the information related to the incident.