Which German composer used cyclic forms in their pieces?
Cyclic form:  Sometimes a theme may occur at the beginning and end (for example, in Mendelssohn's A minor String Quartet or Brahms's Symphony No. 3); other times a theme occurs in a different guise in every part (e.g. Berlioz's "Symphonie Fantastique", and Saint-Saëns's "Organ" Symphony). Felix Mendelssohn: Jakob Ludwig Felix Mendelssohn Bartholdy (] ; 3 February 1809 4 November 1847), born and widely known as Felix Mendelssohn, was a German composer, pianist, organist and conductor of the early Romantic period.
Jakob Ludwig Felix Mendelssohn Bartholdy