Complex sentence: On 4 November 2012, Boenisch joined Bayer 04 Leverkusen on a six-month spell, and following good appearances, on 4 February 2013, Boenisch signed a new contract with the "Werkself", due to expire on June 2016.
Split into simpler sentences: On 4 November 2012, Boenisch joined Bayer 04 Leverkusen on a six-month spell. Following good appearances, on 4 February 2013, Boenisch signed a new contract with the "Werkself", due to expire on June 2016.