typedef T::clock_type_t clk_cntrl_type_t;
This might be representing variable of type clock_type_t declared inside class T.
mxsres_ver0_pin_mode_seq #(sys::mxs_vmxsres_vip) mxsres_seq;
This might be reference to sys::mxs_vmxsres_vip which will be transaction.
mxsres_seq.reset_pins = {sys::mxsmif_vmxsres_vip::ACTIVE_RESET0,sys::mxs_vmxsres_vip::DEEPSLEEP_RESET0};
according to general practice, Enums are declared in capital. so, It might be some enum declared inside sys::mxs_vmxsres_vip class.
This are some points drawn as per general understanding.