How would you diagram this?

[Kondorosi]

Uses for which the capital letter is conventional are personal names and geographic names.



Agree?

[Frank Antonson]

Yes, that is clear to me. (I think you forgot the word "and".) When diagramming free-hand, I would prefer to send the dashed line that connects the relative pronoun to its antecedent out around the subordinate clause instead of through it, but that requires a curved line.
LF

[Kondorosi]

Yes, that is clear to me. (I think you forgot the word "and".)

I always forget something. Thanks LF.