Complex sentence: Over the next few years Mendelssohn travelled widely, including making his first visit to England in 1829, and also visiting amongst other places Vienna, Florence, Milan, Rome and Naples, in all of which he met with local and visiting musicians and artists.
Split into simpler sentences: Over the next few years Mendelssohn travelled widely, which included his first visit to England in 1829. Among aother places were Vienna, Florence, Milan, Rome and Naples, in all of which he met with local and visiting musicians and artists.