Complex sentence: The SOIC traded mainly with the Chinese merchant Puankhequa, who had his factory next to the Swedish, and judging from their letters, Puankhequa and Jean Abraham became friends.
Split into simpler sentences: The SOIC traded mainly with the Chinese merchant Puankhequa, who had his factory next to the Swedish. Judging from their letters, Puankhequa and Jean Abraham became friends.