Complex sentence: Between 1988 and 1991, they recorded three studio albums, including two on Liberty Records; in that same time span, they charted three singles on the "Billboard" Hot Country Singles & Tracks (now Hot Country Songs) charts.
Split into simpler sentences: Between 1988 and 1991, they recorded three studio albums, including two on Liberty Records. In that same time span, they charted three singles on the "Billboard" Hot Country Singles & Tracks (now Hot Country Songs) charts.