Complex sentence: He played for the Oman national football team between 1998 and 2008, and was captain in 2002 and 2003.is most successful season for the national team was during 2001--02 and he the world's leading goalscorer in international matches in 2001.
Split into simpler sentences: He played for the Oman national football team between 1998 and 2008, and was captain in 2002 and 2003. His most successful season for the national team was during 2001--02 and he was the world's leading goalscorer in international matches in 2001.