Complex sentence: He left the university in 1748 and became a private tutor in the family of a relative at Langensalza, where unrequited love for a cousin (the "Fanny" of his odes) disturbed his peace of mind.
Split into simpler sentences: He left the university in 1748 and became a private tutor in the family of a relative at Langensalza. Here unrequited love for a cousin (the "Fanny" of his odes) disturbed his peace of mind.