Complex sentence: The wealthier residents (200,000 $-400,000 $median household income) live in Upper Signal hill, which is located on the top of the hill, above the first few rows of houses which are locate above the famous Signal Hill numbers.
Split into simpler sentences: The wealthier residents of Signal Hill (200,000 $-400,000 $median household income) live in Upper Signal hill, which is located on the top of Signal Hill. The homes in Upper Signal Hill can be seen above the first rows of houses above the famous Signal Hill numbers.