Complex sentence: In 1901, Van Briggle had a major breakthrough perfecting the process and in August invited friends to visit his studio at HOP Ranch where he personalized some of the newly modeled pieces by impressing their initials in them.
Split into simpler sentences: In 1901, Van Briggle had a major breakthrough perfecting his process. In August invited friends to visit his studio at HOP Ranch where he personalized some of the newly modeled pieces by impressing their initials in them.