The given statement is an example of a phrase, specifically, a participial phrase. The element that is necessary to complete the sentence is an independent clause. A participial phrase consists of words with the -ing or -en form plus its modifiers. This kind of phrase always functions as an adjective. The phrase "Beginning in the fall of 1957" is describing a certain noun, which is found in the independent clause.
Answer:
My best friend is the individual on whom I can depend on all through my life. At whatever point I need support, my best friend is consistently there for me. We have made many memories together.
Having a best friend like Mark makes my life simpler.
Hope its help
