Complex sentence: He never made use of it for any military purpose, but he retained a lifelong interest in Russian culture and literature, which culminated in a series of well-received translations of Russian poetry in the 1980s.
Split into simpler sentences: He never made use of it for any military purpose, but he retained a lifelong interest in Russian culture and literature. This has culminated in a series of well-received translations of Russian poetry in the 1980s.