In the play, we see that Sam, Willie and Hally are normal people who get along. However, the first two are black, older men, while Hally is a seventeen-year-old white boy. This has serious consequences in South Africa during apartheid.
During apartheid, black and white people were separated, and they were not allowed to intermingle in any significant way. Moreover, white people were given preference in all matters. This plays a role in the play when Hally spits on Sam, even though they were meant to be friends. Hally is acting out of character, and he immediately regrets his actions. He was extremely upset due to his very complex personal problems.
However, this is a sign of superiority and racism, and it is something a friendship cannot tolerate. Although Sam eventually wants to fix things, Hally is too embarrassed to be friends with him again. I believe that the decision Hally will make is that of not being friends, as he is not a hopeful or positive person. He is more likely to fall into his privileged position and close the door to the friendship.
It's a complete sentence because It has a comma to break the difference between the two statements.
C - The Leaning Tower of Pisa, which started construction in 1173, did not begin sinking into the ground until the third story was built.
The use of commas sets off the dependent clause (which started construction in 1173).
