Complex sentence: Since then, Parkmore RFC have thrived and recently won their first two titles: the J4 Leinster Section C League in 2012 and Leinster Junior Division Champions in 2015, the two first notable win in 105 years of the Carlisle/Parkmore teams playing rugby.
Split into simpler sentences: Since then, Parkmore RFC have thrived and recently won their first two titles. Parkmore won the J4 Leinster Section C League in 2012 and were Leinster Junior Division champions in 2015, the two first notable win in 105 years of the Carlisle/Parkmore teams playing rugby.