Complex sentence: Due to the lengthy 2009--10 season many Barcelona players were given breaks towards the end of the year, so on 29 December 2009 Guardiola brought in Assulin, and team-mates Víctor Vázquez, Thiago Alcântara, and Jonathan dos Santos.
Split into simpler sentences: Due to the lengthy 2009--10 season many Barcelona players were given breaks towards the end of the year. Among these four were Assulin, and team-mates Víctor Vázquez, Thiago Alcântara, and Jonathan dos Santos.