Complex sentence: Merrill began his senior career with the Coquitlam Adanacs of the Western Lacrosse Association, and later the Brampton Excelsiors of Major Series Lacrosse, winning two consecutive Mann Cup championships (2008--2009).
Split into simpler sentences: Merrill began his senior career with the Coquitlam Adanacs of the Western Lacrosse Association. He currently plays with the Brampton Excelsiors of Major Series Lacrosse, and has won two consecutive Mann Cup championships (2008--2009).