Complex sentence: Spending 106 weeks on the German Singles Chart, "Ein Stern (... der deinen Namen trägt)" is the first song to be on that chart for 2 years or longer, and also makes it the song with the longest run ever on that chart.
Split into simpler sentences: Spending 106 weeks on the German Singles Chart, "Ein Stern (... der deinen Namen trägt)" is the first song to be on that chart for 2 years or longer. That makes it also the song with the longest run ever on that chart.