Complex sentence: In 1013, a third peace treaty was signed at Merseburg, requiring in part that Bolesław I recognize Henry II as his overlord in exchange for receiving the March of Lusatia and the March of Meissen as fiefs.
Split into simpler sentences: In 1013, a third peace treaty was signed at Merseburg. As part of peace treaty of 1013, Bolesław I recognized Henry II as his overlord in exchange for receiving the March of Lusatia and the March of Meissen as fiefs.