A gas turbine engine comprising: a fan section including a fan; a compressor section aft of the fan section, and including multiple compressors; a combustor fluidly connected to the compressor section; a turbine section fluidly connected to the combustor, wherein the turbine section includes at least a first turbine and a second turbine, and the second turbine operates at a higher pressure than the first turbine; and a shaft connected to the first turbine such that the first turbine is operable to drive rotation of the shaft, wherein the shaft is a rotational input for a split gear and said split gear is connected to said fan and at least one of said multiple compressors, the split gear includes at least a first gear set having a rotational input and a rotational output and a second gear set having a rotational input and a rotational output, and each of said rotational outputs (272, 276) is a split gear output: characterised in that: the compressor section comprises a first compressor and a second compressor, wherein in use the first compressor is at a low pressure relative to the second compressor, and the first compressor comprises a low speed compressor portion and a high speed compressor portion; and the shaft is directly connected to the high speed compressor portion and directly drives the high speed compressor portion, the rotational output of the first gear set is connected to the low speed compressor portion, such that the rotational output of the first gear set is operable to drive rotation of the low speed compressor portion, the rotational input of the second gear set is connected to the low speed compressor portion such that rotation of the low speed compressor portion drives rotation of the second gear set, and the rotational output of the second gear set is connected to said fan, such that the rotational output of the second gear set is operable to drive rotation of the fan. a fan section including a fan; a compressor section aft of the fan section, and including multiple compressors; a combustor fluidly connected to the compressor section; a turbine section fluidly connected to the combustor, wherein the turbine section includes at least a first turbine and a second turbine, and the second turbine operates at a higher pressure than the first turbine; and a shaft connected to the first turbine such that the first turbine is operable to drive rotation of the shaft, wherein the shaft is a rotational input for a split gear and said split gear is connected to said fan and at least one of said multiple compressors, the split gear includes at least a first gear set having a rotational input and a rotational output and a second gear set having a rotational input and a rotational output, and each of said rotational outputs (272, 276) is a split gear output: characterised in that: the compressor section comprises a first compressor and a second compressor, wherein in use the first compressor is at a low pressure relative to the second compressor, and the first compressor comprises a low speed compressor portion and a high speed compressor portion; and the shaft is directly connected to the high speed compressor portion and directly drives the high speed compressor portion, the rotational output of the first gear set is connected to the low speed compressor portion, such that the rotational output of the first gear set is operable to drive rotation of the low speed compressor portion, the rotational input of the second gear set is connected to the low speed compressor portion such that rotation of the low speed compressor portion drives rotation of the second gear set, and the rotational output of the second gear set is connected to said fan, such that the rotational output of the second gear set is operable to drive rotation of the fan. the compressor section comprises a first compressor and a second compressor, wherein in use the first compressor is at a low pressure relative to the second compressor, and the first compressor comprises a low speed compressor portion and a high speed compressor portion; and the shaft is directly connected to the high speed compressor portion and directly drives the high speed compressor portion, the rotational output of the first gear set is connected to the low speed compressor portion, such that the rotational output of the first gear set is operable to drive rotation of the low speed compressor portion, the rotational input of the second gear set is connected to the low speed compressor portion such that rotation of the low speed compressor portion drives rotation of the second gear set, and the rotational output of the second gear set is connected to said fan, such that the rotational output of the second gear set is operable to drive rotation of the fan.