Complex sentence: GrameenPhone (Bengali: গ্রামীণ ফোন "Gramin Fon") is a GSM-based cellular operator in Bangladesh and market leader with more than 60% of the Bangladeshi market share.
Split into simpler sentences: GrameenPhone (Bengali: গ্রামীণ ফোন "Gramin Fon") is a GSM-based mobile phone company in Bangladesh. It is the mobile phone market leader with more than 60% of the Bangladeshi market share.