Complex sentence: Zajdel spent 11 years as a member of Vision Montreal, before joining the Union Montreal municipal political party, retiring from municipal politics in 2009, citing a desire to spend more time with his family.
Split into simpler sentences: Zajdel spent 11 years as a member of Vision Montreal, before joining the Union Montreal municipal political party. He retired from municipal politics in 2009, citing a desire to spend more time with his family.