Complex sentence: The document included unverified claims that Russian operatives had worked with the Trump campaign to help him get elected, and also alleged that Russia had collected "embarrassing material" involving Trump that could be used to blackmail him.
Split into simpler sentences: The document included unverified claims that Russian operatives had worked with the Trump campaign to help him get elected. It also alleged that Russia had collected "embarrassing material" involving Trump that could be used to blackmail him.