Frontier Communications Corp. is working with advisers to sell assets as the debt-laden rural telecom company looks to raise new funds and fix its capital structure, according to people with knowledge of the matter. The company is considering a sale of a package of landline assets in California, Florida and Texas that it acquired from Verizon Communications Inc. in a $10.5 billion deal just two years ago, the people said, asking not to be identified because the matter is private. The assets are likely to be sold in parts rather than as a single package, one of the people said.