Complex sentence: For the first 30 years of its history the club had been a non-descript amateur side in local Bavarian football until a championship in the Bezirksliga Oberpfalz-Süd in 1998, a league which the club had played in since 1995, earned it promotion to the Bezirksoberliga.
Split into simpler sentences: For the first 30 years of its history the club had been a non-descript amateur side in local Bavarian football. A championship in the Bezirksliga Oberpfalz-Süd in 1998, a league which the club had played in since 1995, earned it promotion to the Bezirksoberliga.