I forgot to include these other sentences. Thank you for your help.
1) He tries to remember what London was like when he was a child. Actually, he cannot remember anything about his childhood, except “a series of bright-lit tableaux, occurring against no background and mostly unintelligible.” (I need to rephrase it).
2)He tries to remember if there have always been rows of dilapidated, patched-up nineteenth-century houses reinforced by the baulks of timber, whose crazy garden walls were leaning in all directions.
3)Then he refers to the bombed places, where now weed grows up over the heaps of rubble. In other places, where the bombs “have cleared a larger patch” colonies of wooden houses have sprung up like chicken-houses.
4)He finally describes the Ministry of Truth as a huge pyramidal structure of shining white concrete
From his place Winston can read the three slogans of the Party.
1. Repost after you've rephrased.
2. OK, except add a comma after "patched-up"
3. "weeds grow" (not "weed grows"); comma after "patch"
4. OK