Original: As he was gazetted assistant secretary to the new Governor of Penang in 1805, he married Olivia Mariamne Fancourt, a widow who was formerly married to Jacob Cassivelaun Fancourt, an assistant surgeon in Madras who had died in 1800.
Simplified: He married Olivia Mariamne Fancourt, who was a widow of Jacob Cassivelaun Fancourt, an assistant surgeon in Madras who had died in 1800.