Complex sentence: Founded in 1806 as an outlet for freshmen frustrated over the Philolexian Society's sophomore standing entrance requirement, it became the latter club's bitter rival, until it was vanquished for some reason in the early 20th century.
Split into simpler sentences: Founded in 1806 as an outlet for freshmen frustrated over the Philolexian Society's sophomore standing entrance requirement. It became the latter club's bitter rival, until it was vanquished for some reason in the early 20th century.