Original: Two of Andrea's sons continued the father's traditions: Pietro Giovanni Guarneri (Pietro da Mantova) (18 February 1655 - 26 March 1720), worked in his father's workshop from around 1670 until his marriage in 1677.
Simplified: Pietro Giovanni Guarneri (18 February  1655 - 26 March  1720), known as Peter of Mantua (Pietro da Mantova) to distinguish him from his nephew Pietro Guarneri. He worked in his father's workshop from around 1670 until his marriage in 1677.