Complex sentence: Haller, who had been three times married, left eight children, the eldest of whom, Gottlieb Emanuel, attained to some distinction as a botanist and as a writer on Swiss historical bibliography (1785--1788,7 vols).
Split into simpler sentences: Haller, who had been three times married, left eight children. The eldest, Gottlieb Emanuel, attained to some distinction as a botanist and as a writer on Swiss historical bibliography (1785--1788,7 vols).