Complex sentence: Not long after that, he secured the place at one of Viennese military bands, as was the trend in the early 1870s and later, he took over as the Kapellmeister of a large civilian orchestra in 1873.
Split into simpler sentences: Not long after that, he secured a place at one of Viennese military bands. As was the current trend, he took over as Kapellmeister of a large civilian orchestra in 1873.