Complex sentence: Between April 2011 and December 2012 he and his family was traveling in Central America with the base in Costa Rica, followed by spending nine months, until September 2013, in Mallorca, Balearic Islands, Spain.
Split into simpler sentences: Between April 2011 and December 2012 he and his family was traveling in Central America with the base in Costa Rica. From December 2012 and September 2013 he was based in Mallorca, Balearic Islands, Spain.