Periphrasis is the expression of an idea by using many words rather than just a few.
In periphrastic writing, function words are used instead of inflection. Periphrastic constructions in your writing can be reduced by using nouns as modifiers rather than by using function words. The changes of the axial position of the model in the tunnel are accomplished by means of a split-sting section that can be added to or removed from the model assembly without disconnecting the lines of the instrumentation. By adding or removing a split-sting section to or from the model assembly, one can change the axial position of the model in the tunnel without disconnecting the instrumentation lines. However, in the sentence above, they describe the types of changes and lines.