Complex sentence: In the first movement alone, Mendelssohn departs from the typical form of a Classical concerto in many ways, the most immediate being the entry of the soloist almost from the outset, which also occurs in his First Piano Concerto.
Split into simpler sentences: In the first movement alone, Mendelssohn departs from the typical form of a Classical concerto in many ways. The most immediate is the entry of the soloist almost from the outset, which happens also in his First Piano Concerto.