The two subjects of the sentence are Colonel Lloyd and his "finely cultivated garden".
C.
"...<u>without regard to partizanship</u>, we are committed to <u>full support of all</u> those resolute peoples, everywhere, who are <u>resisting aggression</u>" means 'Working together, America will help those who are fighting against tyranny.'
This one is actually a good question. Well first, this is from the great gatsby. Fitzgerald was trying to give a balance view in the beginning of who the great gatsby was. And even the author, he lived a wonderful life that is why he related that into Caraway's character, having the same background as him.