Next part: "user-created game content" becomes self-generated perhaps. "Not officially supported" could be independent.
"Find a CC Website: ..." The phrase "Find a CC Website" might be "Locate a CC platform: ...". "Website" could beplatform. Proper nouns like The Sims Resource, SimsVIP, Mod The Sims should stay as they are.
Next sentence: "One of the key features that sets The Sims 3 apart from other games in the series is its vast array of customization options, allowing players to personalize their Sims’ lives, homes, and communities." "Key features" could be primary aspects. "Vast array" might become immense selection. "Customization options" could be personalization choices.
For "In this article, we’ll explore the world of custom content for The Sims 3, focusing on how to download and install CC, as well as provide some popular sources for Sims 3 mods." "Explore" could be investigate. "World" might be domain. "Focus on" could be emphasize.