Complex sentence: The DeFranco Family's active career reached a roadblock when a rock version of their tune "Write Me a Letter" failed to generate much attention and reached no higher than the 104th slot on the charts.
Split into simpler sentences: The DeFranco Family's active career reached a roadblock after that point. A rock version of their tune "Write Me a Letter" failed to generate much attention and reached no higher than the 104th slot on the charts.