Complex sentence: Most peer-to-peer loans are unsecured personal loans, i.e. they are made to an individual rather than a company and borrowers do not provide collateral as a protection to the lender against default.
Split into simpler sentences: Most peer-to-peer loans are unsecured personal loans. They are made to an individual rather than a company, and the borrowers do not provide collateral as a protection to the lender against default.