Complex sentence: It wasn't until 1833 that a thorough and comprehensive account of Washington's personal life began to emerge, authored by Jared Sparks the first biographer that was given access to Washington's many letters by Washington's nephew Bushrod Washington.
Split into simpler sentences: It wasn't until 1833 that a thorough and comprehensive account of Washington's personal life began to emerge. The first such account was authored by Jared Sparks the first biographer that was given access to Washington's many letters by Washington's nephew Bushrod Washington.