Complex sentence: Hubert Gerhard (c.1540/50-1600 born Hertogenbosch) was a Dutch sculptor who may have trained in Florence in the circle of Giambologna, who heavily influenced his Northern Mannerist style.
Split into simpler sentences: Hubert Gerhard (c.1540/50-1600 born Hertogenbosch) was a Dutch sculptor. Gerhard have trained in Florence in the circle of Giambologna, who heavily influenced his Northern Mannerist style.