Complex sentence: Birbal Sahni, FRS (1891-1949), an Indian paleobotanist who studied the fossils of the Indian subcontinent, was also a geologist who took an interest in archaeology.
Split into simpler sentences: Birbal Sahni, FRS (1891-1949) was an Indian paleobotanist who studied the fossils of the Indian subcontinent. He was also a geologist and took an interest in archaeology.