Complex sentence: The necessity of personal explorations among the still unwritten languages of cognate tribes soon made itself evident; and in 1838 he joined a medical fellow student, Dr. Ehrström, in a journey through Lapland.
Split into simpler sentences: The necessity of personal explorations among the still unwritten languages of cognate tribes soon made itself evident. In 1838 he joined a medical fellow student, Dr. Ehrström, in a journey through Lapland.