Complex sentence: James Watt's father was a mathematics teacher and James was a Fellow of the Royal Society and a member of the Lunar Society and friends with Joseph Black with whom he collaborated, so a case could be made for him being both formally educated and an autodidact.
Split into simpler sentences: James Watt's father was a mathematics teacher and James was a Fellow of the Royal Society and a member of the Lunar Society and friends with Joseph Black, with whom he collaborated. Therefore, a case could be made for Watt being both formally educated and an autodidact.