Complex sentence: In the earlier 1800s, some preparations used "agresto", a juice derived from half-ripened grapes, in place of tomatoes, which were not a common food in Italy prior to "the latter decades of the nineteenth century".
Split into simpler sentences: In the earlier 1800s, some preparations used "agresto" in place of tomatoes, a juice derived from half-ripened grapes. This is due to tomatoes not being a common food in Italy prior to "the latter decades of the nineteenth century".