Complex sentence: Hadorph documented ancient monuments during extensive voyages in Sweden, and he collected a great many older manuscripts, such as collections of laws, supervising the production of more than 1000 etchings of runestones.
Split into simpler sentences: Hadorph documented ancient monuments during extensive voyages in Sweden, and he collected a great many older manuscripts, such as collections of laws,. He also supervised the production of more than 1000 etchings of runestones.