Complex sentence: Eleanor was married twice; first in 1327 to James Butler, 1st Earl of Ormonde, (son of Sir Edmond Butler and Lady Joan FitzGerald) who died in 1337 and secondly, six years later in 1343, to Sir Thomas de Dagworth, Lord Dagworth.
Split into simpler sentences: Eleanor was married twice first in 1327 to James Butler, 1st Earl of Ormonde son of Sir Edmond Butler and Lady Joan FitzGerald. James, her first husband died in 1337 and six years later 1343 she married a second time to Sir Thomas de Dagworth, Lord Dagworth.