M. Iriskulov, A. Kuldashev a course in Theoretical English Grammar Tashkent 2008

The Structural Approach to the Problem of Composite Sentences 
One of the representatives of structural linguists Ch. Fries (31), (32) 
considers two kinds of composite sentences: sequence sentences and included 
sentences. The sequence sentences consist of situation sentence and sequence 
sentence. Example: 
1. The government has set up an agency called Future builders. 
2. It has a certain amount of fund to make loans to social enterprises. 
These two sentences are connected with each-other. The first sentence is a 
situation sentence and the second one is a sequence sentence since it develops the 
idea of the situation sentence. 
In the following example “The biggest loan has gone to M. Trust, which 
runs a school for handicapped children.” There are also two sentences included 
into one but they are not separated by a period (full stop). 

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Thus, in both cases there are certain signals that serve to connect the 
constituents, they are “if” in the sequence sentence and “which” - in the included 
one. 
The most significant difference between these function words as signals of 
“inclusion” and the forms given above as signals of sequence lies in the fact that 
these function words of inclusion at the beginning of a sentence look forward to a 
coming sentence unit, while the signals of sequence look backward to the 
preceding sentence unit. 
When sentence units are included in larger units they can fulfill a variety of 
structural functions. In the structure of the larger sentence unit in which they are 
included they often operate as a single unit substitutable for one of the single part 
of the speech. 
C.H. Fries, as we see, makes an attempt to reject the traditional classification 
and terms. He substitutes for the traditional doctrine his theory of included 
sentences and sequences of sentences. His attitude towards the traditional concept 
of the compound sentence is primarily a matter of the punctuation of written texts.