Embedded Vs Dependent Relative Clauses

(1) John wants to marry a woman who is a millionaire

(2) John wants to marry a woman, who is a millionaire

John	wants to marry	a woman [[who is a millionaire]]
Actor	Process: material	Goal

John	wants to marry	a woman		who	(incidentally) is	a millionaire
a			=	b
Actor	Process: material	Goal		Carrier	Process: attributive	Attribute

Viewed from above, in terms of the meaning being realised by the wording, the embedded relative clause in (1) is defining, whereas the dependent relative clause in (2) is non-defining.

Viewed from below, in terms of the sounding that realises the wording, in unmarked cases, the embedded (defining) relative clause serving as Qualifier in (1) is included in the same tone group as the Thing (woman) it qualifies, thus construing it as the same piece of information, whereas the dependent (non-defining) relative clause in (2) is assigned to a separate tone group, thereby construing it as a distinct unit of information.

Included Dependent Elaborating Attributive Clause With Mood Ellipsis

The house nextdoor is up for sale.

The house nextdoor	is	up for sale
Carrier	Process: attributive	Attribute/Cause

John's house, nextdoor, is up for sale.

John’s house	<<nextdoor>>	is	up for sale
	= b
a

John’s house	is	up for sale
Carrier	Process: attributive	Attribute/Cause

(which)	(is)	nextdoor
Carrier	Process: attributive	Attribute/Location
Subject	Finite	Adjunct
Mood		Residue

Dependent Clause Of Location Vs Circumstance Of Location

Location as (ranking) dependent clause in a clause complex:

our frogs	start croaking	when	the sun	sets
a		x b
Behaver	Process		Actor	Process

Location as circumstance with embedded (rankshifted) clause:

our frogs	start croaking	about the time	[[the sun	sets]]
Behaver	Process	Location
			Actor	Process

Location as circumstance without embedding (rankshift):

our frogs	start croaking	at sunset
Behaver	Process	Location