Complex sentence: In 1847, it was decided that the club membership be restricted to those with ties to the college; in doing so they amalgamated with the fledgling University Rowing Club to become the Dublin University Rowing Club.
Split into simpler sentences: In 1847, it was decided that the club membership be restricted to those with ties to the college. In doing so they amalgamated with the fledgling University Rowing Club to become the Dublin University Rowing Club.