Complex sentence: Alajuelense is a founder member and one of most successful teams of the Costa Rican football history, having won 29 times the "Primera División" title, being the only Costa Rican club with least one title gained in each decade.
Split into simpler sentences: Alajuelense is a founder member and one of most successful teams of the Costa Rican football history, having won the "Primera División" title 29 times. It is also the only Costa Rican club with least one title gained in each decade.