Complex sentence: His wife, Samantha Lewthwaite, a native of Aylesbury had converted to Islam and converted him to Islam at age 15, lived with him and gave birth to their second child two months after his death.
Split into simpler sentences: His wife, Samantha Lewthwaite, a native of Aylesbury had converted to Islam and converted him to Islam at age 15. Lewthwaite lived with him and gave birth to their second child two months after his death.