Complex sentence: Dekker had planned to sail a boat that was lent to her by a sponsor, "Guppy", a Hurley 800, with a length of and a beam (width) of.
Split into simpler sentences: Dekker had planned to sail a Hurley 800 she named "Guppy," that had been lent to her by a sponsor. This "Guppy" had a length of and a beam (width) of.